Union County and Mountainside Borough property records for 20 addresses on Prospect Ave, Mountainside, NJ · Last verified July 2026
| Properties | 20 |
|---|---|
| Median Sale Price | $960,000 |
| Deeds and Mortgages on File | 15 |
| Median Price per Sqft | $306 |
| Owner Occupied | 85% |
| Median Annual Tax Bill | $16,680 |
| Median Year Built | 1966 |
| Median Ownership Tenure | 12 years |
Owner names and prior sale amounts shown locked below are available instantly with a free trial.
2,540 sqft · Built 1979 · 0.451 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $14,5702025 | 2 Names on Record Owner Occupied | AssessorUpdated Jul 2026 |
2,712 sqft · Built 1962 · 0.842 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $14,9162025 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
4,282 sqft · Built 1930 · 0.992 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,750,000Apr 2024 | $22,7032025 | Amount on Record Dec 2014 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
3,237 sqft · Built 1937 · 0.88 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $910,000Apr 2004 | $18,7992025 | 1 Name on Record Owner Occupied | AssessorUpdated Jul 2026 |
2,566 sqft · Built 1966 · 0.976 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —Jan 2019 | $14,7992025 | Amount on Record Aug 2001 | 1 Name on Record | Assessor + 1 DocumentUpdated Jul 2026 |
1,848 sqft · Built 1950 · 0.38 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $277,000Jun 1996 | $13,3642025 | 2 Names on Record Owner Occupied | AssessorUpdated Jul 2026 |
1,768 sqft · Built 1965 · 0.98 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —Jan 2019 | $11,9152025 | 1 Name on Record | Assessor + 1 DocumentUpdated Jul 2026 |
2,033 sqft · Built 1960 · 0.362 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $625,000Oct 2014 | $13,5702025 | Amount on Record Jan 1995 | 2 Names on Record Owner Occupied | AssessorUpdated Jul 2026 |
2,948 sqft · Built 1969 · 0.482 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $16,6802025 | 1 Name on Record Owner Occupied | AssessorUpdated Jul 2026 |
3,816 sqft · Built 1957 · 1.08 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,170,000Sep 2021 | $21,5942025 | Amount on Record Jan 2013 | 2 Names on Record Owner Occupied | Assessor + 3 DocumentsUpdated Jul 2026 |
3,050 sqft · Built 1966 · 0.544 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $785,000Jan 2017 | $15,2402025 | Amount on Record Apr 1999 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
2,619 sqft · Built 1966 · 0.603 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $13,4482025 | 1 Name on Record | AssessorUpdated Jul 2026 |
2,193 sqft · Built 1968 · 0.469 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,350,000Dec 2023 | $17,0462025 | Amount on Record Oct 1993 | 1 Name on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
3,260 sqft · Built 1970 · 0.771 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $235,000Nov 1994 | $17,7352025 | 2 Names on Record Owner Occupied | AssessorUpdated Jul 2026 |
2,969 sqft · Built 1971 · 0.723 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $910,000May 2019 | $17,2432025 | Amount on Record Jun 2014 | 1 Name on Record Owner Occupied | Assessor + 2 DocumentsUpdated Jul 2026 |
3,337 sqft · Built 1960 · 0.646 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $960,000Jun 2007 | $18,7852025 | Amount on Record Oct 2005 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
4,568 sqft · Built 1965 · 0.662 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $705,000Feb 2006 | $21,5172025 | 1 Name on Record Owner Occupied | Assessor + 2 DocumentsUpdated Jul 2026 |
2,006 sqft · Built 1960 · 1.51 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $340,000May 1994 | $15,0422025 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
2,678 sqft · Built 1966 · 0.653 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $600,000Nov 2011 | $16,1702025 | 2 Names on Record Owner Occupied | AssessorUpdated Jul 2026 |
2,996 sqft · Built 1976 · 0.607 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $38,500Aug 1974 | $17,8822025 | 1 Name on Record Owner Occupied | AssessorUpdated Jul 2026 |