Mountain Ave, Westfield, NJ Property Records

Union County and Berkeley Heights Township property records for 88 addresses on Mountain Ave, Westfield, NJ · Last verified August 2026

Mountain Ave Highlights

Properties 88
Median Sale Price $1,112,341
Deeds and Mortgages on File 112
Median Price per Sqft $457
Owner Occupied 81%
Median Annual Tax Bill $16,789
Median Year Built 1915
Median Ownership Tenure 15 years

Properties on Mountain Ave

Owner names and prior sale amounts shown locked below are available instantly with a free trial.

115 Mountain Ave

22,208 sqft · built 1939 · 0.604 acres

Last Sale Tax Bill Prior Sale Owner Records
—Nov 1980 $72,3972025 1 Name on Record AssessorUpdated Jul 2026

125 Mountain Ave

3.1 acres

Last Sale Tax Bill Prior Sale Owner Records
1 Name on Record AssessorUpdated Jul 2026

153 Mountain Ave

3,700 sqft · built 1860 · 0.282 acres

Last Sale Tax Bill Prior Sale Owner Records
$375,000Apr 1999 $21,2702025 —Apr 1996 1 Name on Record Owner Occupied AssessorUpdated Jul 2026

166 Mountain Ave

3,240 sqft · built 1870 · 0.229 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,250,000Jul 2022 $16,3632025 Amount on Record Oct 2003 1 Name on Record Assessor + 3 DocumentsUpdated Jul 2026

169 Mountain Ave

2,760 sqft · built 1968 · 0.211 acres

Last Sale Tax Bill Prior Sale Owner Records
$18,8612025 1 Name on Record AssessorUpdated Jul 2026

201 Mountain Ave

0.351 acres

Last Sale Tax Bill Prior Sale Owner Records
1 Name on Record AssessorUpdated Jul 2026

202 Mountain Ave

4,284 sqft · built 1890 · 0.344 acres

Last Sale Tax Bill Prior Sale Owner Records
$17,0822025 1 Name on Record AssessorUpdated Jul 2026

300 Mountain Ave

2,736 sqft · built 1840 · 0.467 acres

Last Sale Tax Bill Prior Sale Owner Records
$787,000May 2004 $19,1062025 Amount on Record Sep 1999 1 Name on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

303 Mountain Ave

3,134 sqft · built 1890 · 0.51 acres

Last Sale Tax Bill Prior Sale Owner Records
$440,000Sep 1997 $20,1102025 Amount on Record Jun 1995 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

314 Mountain Ave

3,520 sqft · built 1901 · 1.6 acres

Last Sale Tax Bill Prior Sale Owner Records
1 Name on Record Owner Occupied AssessorUpdated Jul 2026

317 Mountain Ave

2,924 sqft · built 1890 · 0.585 acres

Last Sale Tax Bill Prior Sale Owner Records
$377,000Jun 1987 $20,3532025 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

324 Mountain Ave

4,160 sqft · built 1900 · 0.314 acres

Last Sale Tax Bill Prior Sale Owner Records
$658,000Sep 2016 $17,8412025 2 Names on Record Owner Occupied Assessor + 4 DocumentsUpdated Jul 2026

325 Mountain Ave

4,055 sqft · built 1890 · 0.351 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,145,000Jul 2020 $23,0902025 Amount on Record Jan 2011 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

329 Mountain Ave

3,609 sqft · built 1900 · 0.293 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,196,000Apr 2007 $23,9652025 Amount on Record Aug 2003 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

330 Mountain Ave

2,747 sqft · built 1890 · 0.332 acres

Last Sale Tax Bill Prior Sale Owner Records
$270,000Jan 1999 $17,4582025 —Aug 1994 1 Name on Record Owner Occupied AssessorUpdated Jul 2026

336 Mountain Ave

3,338 sqft · built 1898 · 0.292 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,970,000Jun 2026 $17,9692025 Amount on Record Apr 2025 1 Name on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

382 Mountain Ave

3.77 acres

Last Sale Tax Bill Prior Sale Owner Records
$8,3182025 1 Name on Record AssessorUpdated Jul 2026

390 Mountain Ave

2,301 sqft · built 2019 · 0.219 acres

Last Sale Tax Bill Prior Sale Owner Records
$799,000May 2020 $14,9502025 Amount on Record Feb 2018 1 Name on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

402 Mountain Ave

2,836 sqft · built 1890 · 0.211 acres

Last Sale Tax Bill Prior Sale Owner Records
$310,000Apr 2001 $14,6572025 1 Name on Record Assessor + 1 DocumentUpdated Jul 2026

403 Mountain Ave

2,119 sqft · built 1910 · 0.201 acres

Last Sale Tax Bill Prior Sale Owner Records
$400,000Feb 2013 $15,2372025 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

404 Mountain Ave

4,016 sqft · built 1890 · 0.226 acres

Last Sale Tax Bill Prior Sale Owner Records
—Feb 2006 $18,9252025 Amount on Record Sep 1993 1 Name on Record Assessor + 1 DocumentUpdated Jul 2026

411 Mountain Ave

2,176 sqft · built 1860 · 0.179 acres

Last Sale Tax Bill Prior Sale Owner Records
$825,000Aug 2016 $16,3862025 Amount on Record Aug 2013 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

415 Mountain Ave

2,396 sqft · built 1880 · 0.169 acres

Last Sale Tax Bill Prior Sale Owner Records
$670,000Mar 2017 $16,3832025 Amount on Record Apr 2015 1 Name on Record Owner Occupied Assessor + 3 DocumentsUpdated Jul 2026

421 Mountain Ave

1,839 sqft · built 1905 · 0.132 acres

Last Sale Tax Bill Prior Sale Owner Records
$204,000Apr 1999 $13,7362025 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

424 Mountain Ave

2,484 sqft · built 1890 · 0.15 acres

Last Sale Tax Bill Prior Sale Owner Records
$780,100Feb 2020 $15,8172025 Amount on Record Jan 2018 1 Name on Record Owner Occupied Assessor + 3 DocumentsUpdated Jul 2026

425 Mountain Ave

1,464 sqft · built 1905 · 0.234 acres

Last Sale Tax Bill Prior Sale Owner Records
$12,4962025 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

428 Mountain Ave

2,174 sqft · built 1900 · 0.097 acres

Last Sale Tax Bill Prior Sale Owner Records
$622,300Aug 2013 $13,7432025 Amount on Record Jul 2003 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

432 Mountain Ave

2,193 sqft · built 1900 · 0.094 acres

Last Sale Tax Bill Prior Sale Owner Records
$14,3072025 1 Name on Record Owner Occupied AssessorUpdated Jul 2026

433 Mountain Ave

1,568 sqft · built 1893 · 0.188 acres

Last Sale Tax Bill Prior Sale Owner Records
$349,000Nov 2001 $12,3952025 Amount on Record Apr 2000 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

436 Mountain Ave

1,715 sqft · built 1912 · 0.13 acres

Last Sale Tax Bill Prior Sale Owner Records
$100,000Nov 1984 $12,9202025 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

437 Mountain Ave

1,669 sqft · built 1908 · 0.136 acres

Last Sale Tax Bill Prior Sale Owner Records
$515,000Feb 2010 $11,7052025 Amount on Record Sep 2006 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

441 Mountain Ave

1,331 sqft · built 1926 · 0.153 acres

Last Sale Tax Bill Prior Sale Owner Records
$495,000Feb 2021 $11,5772025 Amount on Record Oct 2018 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

444 Mountain Ave

2,153 sqft · built 1921 · 0.266 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,112,341Mar 2024 $18,3202025 Amount on Record Oct 2018 2 Names on Record Owner Occupied Assessor + 4 DocumentsUpdated Jul 2026

445 Mountain Ave

2,183 sqft · built 1910 · 0.214 acres

Last Sale Tax Bill Prior Sale Owner Records
$330,000Nov 2013 $13,9932025 Amount on Record Feb 2006 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

450 Mountain Ave

1,578 sqft · built 1910 · 0.231 acres

Last Sale Tax Bill Prior Sale Owner Records
$561,500Dec 2017 $15,2852025 Amount on Record Jun 2015 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

456 Mountain Ave

2,254 sqft · built 1926 · 0.201 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,150,000Mar 2025 $15,9182025 Amount on Record Feb 2018 2 Names on Record Owner Occupied Assessor + 3 DocumentsUpdated Jul 2026

462 Mountain Ave

2,335 sqft · built 1900 · 0.238 acres

Last Sale Tax Bill Prior Sale Owner Records
$15,7142025 1 Name on Record Owner Occupied AssessorUpdated Jul 2026

466 Mountain Ave

1,812 sqft · built 1910 · 0.238 acres

Last Sale Tax Bill Prior Sale Owner Records
$349,900Aug 2001 $15,4822025 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

472 Mountain Ave

3,081 sqft · built 1926 · 0.238 acres

Last Sale Tax Bill Prior Sale Owner Records
$930,000Jul 2021 $17,3502025 Amount on Record Jun 1992 1 Name on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

500 Mountain Ave

4,222 sqft · built 1900 · 0.223 acres

Last Sale Tax Bill Prior Sale Owner Records
$630,000Dec 2015 $21,3892025 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

503 Mountain Ave, #505

4,218 sqft · built 1909 · 0.478 acres

Last Sale Tax Bill Prior Sale Owner Records
$749,500Oct 2005 $20,7982025 —Sep 1996 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

504 Mountain Ave

2,769 sqft · built 1910 · 0.212 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,300,000Jul 2025 $16,8622025 Amount on Record Oct 2012 2 Names on Record Owner Occupied Assessor + 3 DocumentsUpdated Jul 2026

509 Mountain Ave

2,677 sqft · built 1951 · 0.232 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,585,000Jun 2023 $28,6272025 Amount on Record Apr 2022 2 Names on Record Owner Occupied Assessor + 3 DocumentsUpdated Jul 2026

510 Mountain Ave

3,006 sqft · built 1905 · 0.199 acres

Last Sale Tax Bill Prior Sale Owner Records
$745,000May 2015 $19,8532025 Amount on Record Jul 2014 2 Names on Record Owner Occupied Assessor + 6 DocumentsUpdated Jul 2026

514 Mountain Ave

2,005 sqft · built 1927 · 0.199 acres

Last Sale Tax Bill Prior Sale Owner Records
$445,000May 2012 $14,7352025 2 Names on Record Owner Occupied Assessor + 3 DocumentsUpdated Jul 2026

515 Mountain Ave

1,948 sqft · built 1951 · 0.307 acres

Last Sale Tax Bill Prior Sale Owner Records
$730,000Oct 2019 $14,8572025 Amount on Record Jan 2019 2 Names on Record Owner Occupied Assessor + 3 DocumentsUpdated Jul 2026

519 Mountain Ave

3,004 sqft · built 1951 · 0.257 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,653,500Mar 2025 $19,9132025 Amount on Record Sep 2010 2 Names on Record Owner Occupied Assessor + 5 DocumentsUpdated Aug 2026

520 Mountain Ave

2,438 sqft · built 1909 · 0.199 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,125,000Aug 2025 $15,5032025 Amount on Record Jan 1997 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

525 Mountain Ave

2,624 sqft · built 1951 · 0.293 acres

Last Sale Tax Bill Prior Sale Owner Records
$570,000Nov 2010 $16,7892025 2 Names on Record Assessor + 2 DocumentsUpdated Jul 2026

526 Mountain Ave

1,720 sqft · built 1952 · 0.199 acres

Last Sale Tax Bill Prior Sale Owner Records
$39,500May 1997 $14,1392025 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

530 Mountain Ave

2,510 sqft · built 1911 · 0.199 acres

Last Sale Tax Bill Prior Sale Owner Records
$685,000Nov 2011 $15,9662025 Amount on Record Sep 1997 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

536 Mountain Ave

1,720 sqft · built 1952 · 0.199 acres

Last Sale Tax Bill Prior Sale Owner Records
$400,000Jun 2001 $14,0322025 Amount on Record Jun 1994 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

540 Mountain Ave

1,740 sqft · built 1917 · 0.166 acres

Last Sale Tax Bill Prior Sale Owner Records
$14,4242025 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

542 Mountain Ave

1,866 sqft · built 1920 · 0.192 acres

Last Sale Tax Bill Prior Sale Owner Records
$482,500Jul 2002 $15,9712025 1 Name on Record Assessor + 1 DocumentUpdated Jul 2026

548 Mountain Ave

1,892 sqft · built 1920 · 0.166 acres

Last Sale Tax Bill Prior Sale Owner Records
$365,000Apr 2002 $14,1102025 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

555 Mountain Ave

3,078 sqft · built 1915 · 0.551 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,725,000Jun 2025 $21,2512025 Amount on Record Jun 1990 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

602 Mountain Ave

1,518 sqft · built 1928 · 0.205 acres

Last Sale Tax Bill Prior Sale Owner Records
$760,000May 2026 $13,8572025 Amount on Record Jul 1991 1 Name on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

605 Mountain Ave

6,216 sqft · built 1910 · 0.551 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,840,000Dec 2019 $42,5992025 Amount on Record Aug 2008 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

608 Mountain Ave

2,702 sqft · built 1923 · 0.423 acres

Last Sale Tax Bill Prior Sale Owner Records
$232,000Jan 1990 $18,6322025 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

614 Mountain Ave

2,377 sqft · built 1920 · 0.559 acres

Last Sale Tax Bill Prior Sale Owner Records
1 Name on Record Owner Occupied AssessorUpdated Jul 2026

615 Mountain Ave

2,992 sqft · built 1922 · 0.318 acres

Last Sale Tax Bill Prior Sale Owner Records
$262,000Jul 1986 $21,7742025 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

623 Mountain Ave

2,830 sqft · built 1929 · 0.261 acres

Last Sale Tax Bill Prior Sale Owner Records
$865,000Sep 2014 $23,6952025 Amount on Record Apr 2011 2 Names on Record Assessor + 2 DocumentsUpdated Jul 2026

700 Mountain Ave

3,655 sqft · built 1930 · 0.361 acres

Last Sale Tax Bill Prior Sale Owner Records
$230,000Oct 1985 $23,3622025 1 Name on Record Owner Occupied AssessorUpdated Jul 2026

701 Mountain Ave

1,815 sqft · built 1952 · 0.285 acres

Last Sale Tax Bill Prior Sale Owner Records
$830,000Jul 2025 $16,0002025 Amount on Record Sep 1994 1 Name on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

702 Mountain Ave

2,515 sqft · built 1914 · 0.231 acres

Last Sale Tax Bill Prior Sale Owner Records
$999,000Sep 2022 $19,3672025 Amount on Record May 2021 2 Names on Record Owner Occupied Assessor + 4 DocumentsUpdated Jul 2026

706 Mountain Ave

2,408 sqft · built 1915 · 0.23 acres

Last Sale Tax Bill Prior Sale Owner Records
$267,000Jun 1989 $15,7552025 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

708 Mountain Ave

2,639 sqft · built 1920 · 0.224 acres

Last Sale Tax Bill Prior Sale Owner Records
$59,000Jun 1976 $16,7822025 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

709 Mountain Ave

2,682 sqft · built 1929 · 0.23 acres

Last Sale Tax Bill Prior Sale Owner Records
$300,000Sep 1987 $16,2182025 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

714 Mountain Ave

3,094 sqft · built 1923 · 0.213 acres

Last Sale Tax Bill Prior Sale Owner Records
$284,000Jun 1996 $18,5932025 Amount on Record Nov 1994 2 Names on Record Owner Occupied Assessor + 3 DocumentsUpdated Jul 2026

717 Mountain Ave

3,230 sqft · built 1931 · 0.247 acres

Last Sale Tax Bill Prior Sale Owner Records
$320,000Aug 1996 $19,8902025 1 Name on Record Owner Occupied AssessorUpdated Jul 2026

721 Mountain Ave

2,313 sqft · built 1957 · 0.247 acres

Last Sale Tax Bill Prior Sale Owner Records
$365,000Jul 2002 $17,6352025 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

722 Mountain Ave

2,567 sqft · built 1927 · 0.157 acres

Last Sale Tax Bill Prior Sale Owner Records
$990,000Feb 2024 $15,6252025 —Jun 1977 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Aug 2026

726 Mountain Ave

1,721 sqft · built 1928 · 0.294 acres

Last Sale Tax Bill Prior Sale Owner Records
$212,000Nov 1996 $14,5152025 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

731 Mountain Ave

2,982 sqft · built 1926 · 0.261 acres

Last Sale Tax Bill Prior Sale Owner Records
$750,000Jan 2011 $18,7212025 Amount on Record Sep 2008 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

732 Mountain Ave

2,620 sqft · built 1925 · 0.255 acres

Last Sale Tax Bill Prior Sale Owner Records
$540,000Sep 2012 $16,5962025 Amount on Record Sep 1998 1 Name on Record Owner Occupied Assessor + 3 DocumentsUpdated Jul 2026

738 Mountain Ave

2,726 sqft · built 1930 · 0.376 acres

Last Sale Tax Bill Prior Sale Owner Records
$115,600Nov 2015 $17,0482025 Amount on Record May 1997 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

804 Mountain Ave

3,165 sqft · built 1920 · 0.406 acres

Last Sale Tax Bill Prior Sale Owner Records
$911,000Dec 2009 $21,3502025 Amount on Record Aug 2009 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

807 Mountain Ave

7,749 sqft · built 2008 · 0.639 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,000,000Sep 2005 $49,1842025 2 Names on Record AssessorUpdated Jul 2026

810 Mountain Ave

3,063 sqft · built 1915 · 0.459 acres

Last Sale Tax Bill Prior Sale Owner Records
$999,999Dec 2020 $19,6312025 Amount on Record Jan 2011 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Aug 2026

817 Mountain Ave

3,468 sqft · built 1922 · 0.37 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,780,000Jul 2024 $27,7882025 Amount on Record Jul 2020 2 Names on Record Owner Occupied Assessor + 4 DocumentsUpdated Jul 2026

824 Mountain Ave

built 1960 · 2.05 acres

Last Sale Tax Bill Prior Sale Owner Records
—Jul 1998 $107,1512025 1 Name on Record AssessorUpdated Jul 2026

825 Mountain Ave

3,250 sqft · built 1915 · 0.37 acres

Last Sale Tax Bill Prior Sale Owner Records
$247,000Mar 1994 $16,7362025 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

829 Mountain Ave

2,914 sqft · built 1915 · 0.366 acres

Last Sale Tax Bill Prior Sale Owner Records
$16,400Oct 1985 $18,0542025 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

835 Mountain Ave

2,523 sqft · built 1959 · 0.363 acres

Last Sale Tax Bill Prior Sale Owner Records
$635,000Feb 2018 $14,6092025 Amount on Record Nov 2012 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

836 Mountain Ave

2,936 sqft · built 1910 · 0.404 acres

Last Sale Tax Bill Prior Sale Owner Records
—Mar 1997 $24,6872025 1 Name on Record AssessorUpdated Jul 2026

843 Mountain Ave

1,848 sqft · built 1920 · 0.356 acres

Last Sale Tax Bill Prior Sale Owner Records
$775,000Nov 2020 $14,2882025 Amount on Record May 2016 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

847 Mountain Ave

2,551 sqft · built 1900 · 0.189 acres

Last Sale Tax Bill Prior Sale Owner Records
$14,8382025 2 Names on Record Assessor + 1 DocumentUpdated Jul 2026

848 Mountain Ave

3,708 sqft · built 1920 · 0.196 acres

Last Sale Tax Bill Prior Sale Owner Records
$23,4362025 1 Name on Record AssessorUpdated Jul 2026

Wildfire Risk on Mountain Ave

Source: USDA Forest Service Wildfire Risk to Communities · 2nd edition (2024), fuels as of 2020

Wildfire RiskLow
this street's cells rank above 5% of the US · above 12% of New Jersey
Wildfire LikelihoodLess than 1 in 10,000 per year
ExposureDirect
4 of 10 cells directly exposed · 9 adjoin burnable vegetation

Property Records in Nearby Streets