Rockingham County, NH parcel and infrastructure data API
Korzy has about 140,000 parcel records for Rockingham County, New Hampshire, with source updates through November 2026. Nearly every record carries land use; 92% include values and 88% include building size. In and around the county the API also maps 6 power plants with about 3,100 MW of capacity, led by nuclear; 4 data-center projects (3 operating); and 1 port with reported cargo. Look up any parcel by address or coordinates, then check water, sewer and infrastructure context at the same point.
Parcel coverage in Rockingham County
About 140,000 parcel records with boundaries, situs addresses and parcel numbers, with the latest source update from November 2026. Each record has a stable korzy_id you can store and look up again with /v1/records/{id}. Share of records with each field:
| Field | Coverage | Share |
|---|---|---|
| Situs address | Nearly all · 99% | |
| Owner name | Not published | |
| Assessed or market value | Most · 92% | |
| Year built | Most · 85% | |
| Building size | Most · 88% | |
| Last sale | Many · 52% | |
| Land use | Nearly all · 97% | |
| Zoning | Not published |
Rockingham County records do not include owner names. See pricing for credit costs.
Infrastructure in and around Rockingham County
Power plants
6 operable plants with about 3,100 MW of nameplate capacity; largest by capacity: nuclear, natural gas, battery and pumped storage.
Within 50 km: /v1/lookup section power; details: /v1/records/{id}
Substations and transmission
About 45 in-service substations, 9 rated 230 kV or higher.
About 310 miles of transmission lines: about 150 mi at 100–161 kV; about 20 mi at 220–287 kV; about 140 mi at 345 kV; 4 mi at DC.
Water and sewer service
Service areas of about 210 community water systems cover about 12% of the county.
Sewer service areas of about 15 systems cover about 3%.
At an address or point: /v1/lookup section utilities
Data-center projects
4 tracked projects: 3 operating, 1 status not reported.
Within 10 km: /v1/lookup section datacenters
Grid capacity data
1 utility-published grid capacity layer cover parts of Rockingham County, including loading forecasts.
Nearby records: /v1/lookup section grid
Flood zones and wetlands
Special flood hazard areas cover about 12% of the county on the current federal flood maps, published June 2026.
Mapped wetlands cover about 12%.
At an address or point: /v1/lookup section environment
Rail, ports and freight
- About 40 miles of active rail, about 30 of it main line
- About 35 miles of national freight network highway
- 1 port area with reported cargo tonnage
Within 25 km: /v1/lookup section logistics
Example requests for Rockingham County
The lookup response is a real production response, trimmed to the main fields. Every request needs an API key with api:read; see authentication and credits and limits.
1. Find a parcel and its water and sewer service
/v1/lookup matches 300 EXETER RD, Hampton, NH and returns the parcel's korzy_id and record, plus the water and sewer service areas at the parcel and the nearest treatment plants. 2 credits.
curl --fail-with-body -sS \
-H "Authorization: Bearer $KORZY_API_KEY" \
-H "Content-Type: application/json" \
-d '{"address":"300 EXETER RD, Hampton, NH","sections":["utilities"]}' \
https://api.korzy.co/v1/lookupPython
import os
import requests
response = requests.post(
"https://api.korzy.co/v1/lookup",
json={"address": "300 EXETER RD, Hampton, NH", "sections": ["utilities"]},
headers={"Authorization": f"Bearer {os.environ['KORZY_API_KEY']}"},
timeout=60,
)
response.raise_for_status()
body = response.json()
parcel = body["parcels"]["records"][0]
print(parcel["korzy_id"], body["sections"]["utilities"]["status"])Production response (trimmed)
{
"location": {
"longitude": -70.85574482819189,
"latitude": 42.9554008,
"address": "300 EXETER RD, Hampton",
"match_type": "exact"
},
"parcels": {
"records": [
{
"id": "33015-5035ef89c076e24fdd75",
"korzy_id": "33015-5035ef89c076e24fdd75",
"parcelid": "067-001-001",
"parceladdr": "300 EXETER RD",
"parcelcity": "Hampton",
"situs_zip": "03842",
"statefp": "33",
"geoid": "33015",
"longitude": -70.85574482819189,
"latitude": 42.9554008,
"usedesc": "STORE/SHOP MDL-94",
"land_use_code": "33",
"yearbuilt": 2025,
"bldgsqft": 2400,
"taxacres": 1.35,
"totalvalue": 741400,
"saledate": "2024-07-24",
"saleamt": 300000,
"updated": "2026-11-03"
}
],
"truncated": false
},
"sections": {
"utilities": {
"status": "ok",
"data": {
"water": [
{
"id": "utility:water:42663",
"feature_id": "water:42663",
"name": "AQUARION WATER/NH",
"boundary_basis": "System Sourced"
}
],
"treatment_plants": [
{
"id": "utility:treatment:2489",
"feature_id": "treatment:2489",
"name": "Hampton WWTF",
"distance_km": 4.590067218097125
},
{
"id": "utility:treatment:2488",
"feature_id": "treatment:2488",
"name": "Exeter WWTF",
"distance_km": 8.615351245647348
},
{
"id": "utility:treatment:2493",
"feature_id": "treatment:2493",
"name": "Seabrook WWTF",
"distance_km": 9.957081349048929
}
],
"truncated": {
"water": false,
"sewer": false
}
},
"provenance": [
{
"dataset": "water",
"data_version": "63b7c1c3-9661-4fed-a59f-ddbfff80c2e4"
},
{
"dataset": "sewer",
"data_version": "63b7c1c3-9661-4fed-a59f-ddbfff80c2e4"
},
{
"dataset": "treatment",
"data_version": "63b7c1c3-9661-4fed-a59f-ddbfff80c2e4"
}
]
}
},
"credits": {
"charged": 2,
"refunded": 0
}
}2. Add value and sale fields
/v1/enrich returns the fields you choose for up to 25 parcels per request; here the parcel 33015-5035ef89c076e24fdd75. 1 credit.
curl --fail-with-body -sS \
-H "Authorization: Bearer $KORZY_API_KEY" \
-H "Content-Type: application/json" \
-d '{"items":[{"korzy_id":"33015-5035ef89c076e24fdd75"}],"fields":["identity","value","sale"]}' \
https://api.korzy.co/v1/enrich3. Fetch the record again by ID
/v1/records/{id} returns the stored parcel's full record, without owner fields. 1 credit.
curl --fail-with-body -sS \
-H "Authorization: Bearer $KORZY_API_KEY" \
https://api.korzy.co/v1/records/33015-5035ef89c076e24fdd75JavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("33015-5035ef89c076e24fdd75")}`, {
headers: { Authorization: `Bearer ${process.env.KORZY_API_KEY}` },
});
if (!response.ok) throw new Error(`Korzy API ${response.status}`);
const { record } = await response.json();
console.log(record.parceladdr, record.usedesc);Rockingham County data questions
- How many parcels in Rockingham County include year built?
- About 120,000 of about 140,000 parcel records (85%) include year built.
- Does the Korzy API return owner names for Rockingham County parcels?
- Rockingham County parcel records do not include owner names. Values, land use and building facts are returned where the county publishes them.
- How many data-center projects are in Rockingham County?
- Korzy tracks 4 data-center projects in Rockingham County: 3 operating and 1 status not reported. A /v1/lookup with the datacenters section lists projects within 10 km of any address or point.
- How much power generation is in Rockingham County?
- 6 operable power plants in Rockingham County total about 3,100 MW of nameplate capacity, mainly nuclear, natural gas and battery and pumped storage.
- Which water systems serve Rockingham County?
- Service areas of about 210 community water systems cover about 12% of Rockingham County, and sewer service areas cover about 3%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.
More featured counties
- Essex County, MABorders Rockingham County · about 270,000 parcels
- Hillsborough County, NHBorders Rockingham County · about 140,000 parcels
Build on Rockingham County parcel data
Lookups, enrichment and records work the same in every county Korzy covers. Credits are shared across parcels, utilities, environment, logistics, power, grid, data-center and terrain sections.