Zoning · ZIP 03801
Zoning in Portsmouth (NH), NH
ZIP 03801 (New Hampshire) — zoning summary sourced from Municipal planning departments. Refreshed on the cadence of the primary regulator with every claim cited to the source record.
What lands here
Pages translate the city's zoning code into plain English for the ZIP's dominant classifications, with a link to the planning department's official map.
Source & refresh
Municipal planning departments. Refreshed annual plus ad-hoc rezonings. Stale data is flagged, never silently served. Primary source →
Limitations specific to this source
Top-25 cities covered at launch. Houston has no zoning laws (special handling). Elsewhere, zipradar links to the planning department's portal.
New Hampshire context
Radon, lead in older housing
New Hampshire is uniformly Zone 1 radon. Older Manchester + Nashua + Portsmouth housing stock carries lead-service-line risk. Coastal flood zones limited to small NH coastline.
See New Hampshire state page for the full state-level rollup across all 12 dimensions.
Read more on zoning
Editorial deep-dives explaining the source data, its limits, and how to read it.
Property tax millage — what 'mill' means and how your bill is computed
Plain-English guide to property tax millage rates, assessment ratios, and homestead exemptions. How county assessors compute your annual property tax bill.
Deed records — what they show and what they don't
Plain-English guide to county deed records: what gets filed, how to look up a property's history, and why zipradar aggregates only counts (never owner names).
Zoning codes — what R-1, C-2, M-1, MU mean and why your house is one
Plain-English guide to common US zoning codes: R-1 / R-2 / C-1 / C-2 / M-1 / MU. Why zoning matters for your home, your neighbors, and what you can build.
Homestead exemption — state-by-state property tax savings
Every US state offers a homestead exemption that reduces property tax for owner-occupied homes. State-by-state amounts and how to file.
Full dashboard for ZIP 03801
Zoning is one of twelve dimensions zipradar federates per address. See the full federated summary for ZIP 03801:
Open Portsmouth (NH), NH dashboard →Frequently asked questions
What is the zoning for ZIP 03801?
Zoning for ZIP 03801 (Portsmouth (NH), New Hampshire) is federated from Municipal planning departments. Pages translate the city's zoning code into plain English for the ZIP's dominant classifications, with a link to the planning department's official map. Refreshed annual plus ad-hoc rezonings — see /methodology for full source citations and refresh-cadence details.
Where does the zoning data come from?
Municipal planning departments (primary regulator). zipradar federates zoning on the regulator's published cadence: annual plus ad-hoc rezonings. Every claim cites the source record; stale data is flagged, never silently served. The primary source URL: https://zipradar.org/methodology/.
What are the limitations of zoning data?
Top-25 cities covered at launch. Houston has no zoning laws (special handling). Elsewhere, zipradar links to the planning department's portal.
Is ZIP 03801 (Portsmouth (NH)) data current?
Last verified 2026-06-10. Zoning for ZIP 03801 refreshes annual plus ad-hoc rezonings per Municipal planning departments cadence. See the full ZIP dashboard at /zip/03801/ for all 12 dimensions side-by-side.