343 Union St
Portsmouth, NH 03801
3 bd 2 ba 1,996 sqft Built 1900 Lot 5,227 sqft single_family
No recorded sales
Location
Timeline: Sale, Listing & Tax History
Recorded events
No recorded events
No sale or listing events are on file for this property.
Tax assessment history
| Year | Building | Land | Total assessed | Tax paid |
|---|---|---|---|---|
| 2025 | $505,700 | $598,800 | $1,104,500 | $12,713 |
| 2023 | $284,400 | $356,400 | $640,800 | $10,336 |
| 2022 | $284,400 | $356,400 | $640,800 | $9,740 |
| 2021 | $284,400 | $356,400 | $640,800 | $9,631 |
| 2020 | $284,400 | $356,400 | $640,800 | $9,420 |
| 2019 | $284,400 | $356,400 | $640,800 | $9,522 |
| 2018 | $252,900 | $324,000 | $576,900 | $9,138 |
| 2017 | $252,900 | $324,000 | $576,900 | $8,873 |
| 2016 | $223,700 | $247,300 | $471,000 | $8,026 |
| 2015 | $226,600 | $247,300 | $473,900 | $7,957 |
| 2014 | $201,300 | $216,800 | $418,100 | $7,568 |
| 2011 | $201,300 | $216,800 | $418,100 | $7,259 |
| 2007 | $231,700 | $158,900 | $390,600 | $6,382 |
Property facts
Year built
1900
Property type
single_family
Stories
2
Beds
3
Baths
2
Living area
1,996 sqft
Lot size
5,227 sqft
ZIP code
03801
City
Portsmouth
Street
Union St
Coordinates
43.06896, -70.76315
Comparable properties nearby
Block-level micro-comps
Same street, ±3 house numbers, sold in the last 24 monthsFrequently asked questions
When did 343 Union St last sell?
No public-record sale is on file for 343 Union St.
What is the current tax assessment for 343 Union St?
The most recent total assessment for 343 Union St (year 2025) is $1,104,500 with $12,713 in property tax.
When was 343 Union St built?
343 Union St was built in 1900.
How does 343 Union St compare to others on Union St?
We track 8 other properties on Union St. Browse the list under "Other properties on Union St" to compare beds, baths, and sale history.
What are the property facts for 343 Union St?
343 Union St is a 3 bed, 2 bath, 1,996 sqft, 5,227 sqft lot single_family.
Is 343 Union St a flip candidate?
No — 343 Union St does not appear in our flips dataset.
Is 343 Union St a tax-appeal candidate?
No — 343 Union St is not currently flagged as a tax-appeal candidate.
Forecast for this area
ZIP-area linear projection — not a per-property automated valuationQuarterly trend
+0.5%
Implied 1-yr
+2.1%
2026 Q3
$1.3M
2026 Q4
$1.31M
ZIP 03801 — Median Price History + Forecast
Explore nearby
Geography
Other properties on Union St