Union County, Mountainside Borough and Westfield Town property records for 38 addresses on Mountain Ave, Mountainside, NJ · Last verified August 2026
| Properties | 38 |
|---|---|
| Median Sale Price | $820,000 |
| Deeds and Mortgages on File | 24 |
| Median Price per Sqft | $248 |
| Owner Occupied | 34% |
| Median Annual Tax Bill | $9,272 |
| Median Year Built | 1930 |
| Median Ownership Tenure | 17 years |
Owner names and prior sale amounts shown locked below are available instantly with a free trial.
0.183 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $495,000Jun 1985 | $5872025 | 2 Names on Record | AssessorUpdated Jul 2026 |
0.036 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $650,000Nov 2003 | $4732025 | 1 Name on Record | AssessorUpdated Jul 2026 |
0.564 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,467,000Jan 2020 | $34,7172025 | 1 Name on Record | AssessorUpdated Jul 2026 |
0.322 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $240,000Nov 1997 | $30,6602025 | 1 Name on Record Owner Occupied | Assessor + 2 DocumentsUpdated Jul 2026 |
0.189 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $2,250,000Sep 2020 | $4,7842025 | Amount on Record Jan 2020 | 1 Name on Record | Assessor + 1 DocumentUpdated Jul 2026 |
0.196 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $9,1852025 | 1 Name on Record | AssessorUpdated Jul 2026 |
0.17 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $10,2732025 | 1 Name on Record | AssessorUpdated Jul 2026 |
2,012 sqft · Built 1890 · 0.229 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $7,2872025 | 1 Name on Record | AssessorUpdated Jul 2026 |
0.551 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,200,000Jun 2000 | $22,6362025 | 1 Name on Record | AssessorUpdated Jul 2026 |
0.431 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $28,1402025 | 1 Name on Record | AssessorUpdated Jul 2026 |
0.317 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $420,000Aug 2009 | $11,5862025 | 1 Name on Record | AssessorUpdated Jul 2026 |
0.341 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $24,7802025 | 1 Name on Record | AssessorUpdated Jul 2026 |
0.262 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $820,000Jan 2024 | —Sep 2022 | 2 Names on Record | Assessor + 3 DocumentsUpdated Aug 2026 |
0.733 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $9,0302025 | 1 Name on Record Owner Occupied | AssessorUpdated Jul 2026 |
0.972 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $434,000Oct 1993 | $15,8362025 | 1 Name on Record | AssessorUpdated Jul 2026 |
0.435 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $750,000Mar 2012 | $18,3082025 | 1 Name on Record | AssessorUpdated Jul 2026 |
2,212 sqft · Built 1850 · 0.257 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $550,000Mar 2021 | $11,3462025 | Amount on Record Feb 2007 | 1 Name on Record | Assessor + 1 DocumentUpdated Jul 2026 |
1,654 sqft · Built 1946 · 0.096 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $7,1062025 | 1 Name on Record | AssessorUpdated Jul 2026 |
1,578 sqft · Built 1930 · 0.644 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $400,000Apr 2002 | $7,7682025 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
5.42 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,349,921Jul 2024 | Amount on Record Dec 2021 | 1 Name on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
2,035 sqft · Built 1936 · 0.248 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $250,000Oct 2000 | $9,2722025 | 1 Name on Record Owner Occupied | AssessorUpdated Jul 2026 |
4,702 sqft · Built 2003 · 0.68 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $23,3542025 | 1 Name on Record Owner Occupied | AssessorUpdated Jul 2026 |
3,520 sqft · Built 2007 · 0.68 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $895,000Aug 2008 | $18,8182025 | Amount on Record Jul 2006 | 2 Names on Record Owner Occupied | AssessorUpdated Jul 2026 |
0.248 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —Jun 1992 | $14,2192025 | 2 Names on Record | AssessorUpdated Jul 2026 |
2,092 sqft · Built 1920 · 0.16 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $7,1442025 | 2 Names on Record Owner Occupied | AssessorUpdated Jul 2026 |
2,592 sqft · Built 1870 · 0.571 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $505,000Aug 2022 | $10,1492025 | —Jun 2003 | 1 Name on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
2,280 sqft · Built 1926 · 0.307 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $650,000Jan 2019 | $9,0662025 | 2 Names on Record | Assessor + 1 DocumentUpdated Jul 2026 |
1,264 sqft · Built 2002 · 0.519 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —Dec 2002 | $8,5492025 | 1 Name on Record Owner Occupied | AssessorUpdated Jul 2026 |
0.948 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $150,000Aug 1993 | $2,1862025 | 2 Names on Record | AssessorUpdated Jul 2026 |
1,078 sqft · Built 1930 · 0.35 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $230,000Nov 1999 | $7,8882025 | Amount on Record Feb 1997 | 2 Names on Record | AssessorUpdated Jul 2026 |
2.71 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 1 Name on Record | AssessorUpdated Jul 2026 |
0.375 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 1 Name on Record | AssessorUpdated Jul 2026 |
1,442 sqft · Built 1946 · 0.189 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $320,000Aug 2022 | $8,9022025 | —May 2022 | 1 Name on Record | Assessor + 2 DocumentsUpdated Jul 2026 |
2,822 sqft · Built 1916 · 0.862 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $10,4392025 | 1 Name on Record Owner Occupied | Assessor + 2 DocumentsUpdated Jul 2026 |
2,464 sqft · Built 1930 · 0.314 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $10,1722025 | 1 Name on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
1,500 sqft · Built 1930 · 0.151 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $500,000Mar 2026 | $6,3292025 | Amount on Record Nov 1989 | 1 Name on Record Owner Occupied | Assessor + 5 DocumentsUpdated Jul 2026 |
1,608 sqft · Built 1926 · 0.187 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $365,000May 2018 | $7,0902025 | Amount on Record Oct 2010 | 2 Names on Record | Assessor + 1 DocumentUpdated Jul 2026 |
2,400 sqft · 0.351 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $432,500Mar 2017 | $8,1212025 | Amount on Record Sep 1996 | 1 Name on Record | AssessorUpdated Jul 2026 |