Thornton, CO land: flood and parcels
46,943 parcels
1.2% of Thornton’s 46,943 parcels are in a FEMA flood zone.
County roll 2026 · Map data Oct 26, 2026
- Acres on the roll21,325
- In a FEMA flood zone1.2%special flood hazard area
Colorado 2026 taxes: bills go out in January 2027; first half due March 1, 2027, second half June 15, 2027.
Free account: 25 parcel cards a day on the map, with watches and a saved search. Get started free
Our map has no zoning layer for Thornton yet. Ask the city's or Adams County's planning office which zoning applies to a parcel.
Around Thornton
Parcels to start with
Flood zones and wetlands
Land in Thornton by useLand use on the county roll
| Land class | Parcels | Share |
|---|---|---|
| Building on record | 42,209 | 90% |
| Other or not coded | 3,694 | 7.9% |
| Institutional | 970 | 2.1% |
| Farm and timber | 70 | 0.1% |
70 farm and timber parcels cover 2,090 acres. County tax roll 2026 (county file Oct 2026); land class read from the roll's land-use and building fields.
Typical lot sizeThe typical lot, from the roll
The median parcel in Thornton is 0.16 acre (46,369 parcels with a size).
Acres from the county roll, or from the parcel's own outline where the roll's figure is off by more than three times. Condominium units that share one point (each carrying the whole complex's acres) are left out of the lot sizes.
Land parcels in ThorntonFarm and timber parcels to start with
- 1.4 acres of farm and timber land
- 1.3 acres of farm and timber land
- 1.2 acres of farm and timber land
- 1.2 acres of farm and timber land
- 14800 Washington St 230.5 acres
- 147.4 acres of farm and timber land
- 5100 E 168th Ave 139.6 acres
- 3225 E 160th Ave 130.4 acres
Farm and timber parcels of an acre or more, each with its own page of public roll facts.
Nearby townsTowns around it
Questions about Thornton landAnswers from the public records
How many parcels are in Thornton, CO?
46,943 parcels on the 2026 Adams County tax roll (county file Oct 2026) inside the Census Bureau's boundary for Thornton, which can differ from its own limits at the edges, covering 21,325 acres.
How much vacant land is in Thornton, CO?
Colorado's vacant-land class failed our statewide aerial check (19 of 120 lots sampled across the state were in use or doubtful: a house, a salvage yard, trailer homes, a farmstead, irrigated hay meadows, lots still under crop), so we don't call any parcel in Adams County vacant land.
What is the typical lot size in Thornton?
The median parcel is 0.16 acre, from 46,369 parcels with a recorded size.
How much of Thornton is in a flood zone?
1.2% of parcels are in a FEMA special flood hazard area (National Flood Hazard Layer, as of Oct 2026). Check each parcel's own flood line before you buy.
Are there wetlands in Thornton?
2.3% of parcels are a quarter or more wetland on the USFWS National Wetlands Inventory, a mapping guide, not a legal delineation.
What is Thornton zoned?
Our map has no zoning layer for Thornton yet. Ask the city's or Adams County's planning office which zoning applies to a parcel.
Are there land prices for Thornton?
No land-price range is shown for Thornton yet. We print no land-price range for Adams County yet.
Where does this data come from?
Parcels: State of Colorado public parcels (OIT) and county assessor layers. Flood: FEMA National Flood Hazard Layer. Wetlands: USFWS National Wetlands Inventory. Towns: U.S. Census places. Every figure is counted from those files on our map.
More in Adams CountyIts other towns
Sources & methodSources, dates and how these figures are built
Property tax due dates
Colorado Revised Statutes 39-10-104.5, 39-5-122 and 39-8-106. Checked Oct 13, 2026.
What Groundwork can price in Thornton
Facts only: no price estimate on any parcel here.
Land sale prices
We hold this county's recorded deeds, but its file does not mark which sales are arm's-length land sales, so this page prints no land price range yet.
Sources
Parcels: State of Colorado public parcels (OIT) and county assessor layers (2026 roll, county file Oct 2026); flood: FEMA National Flood Hazard Layer (as of Oct 2026); wetlands: USFWS National Wetlands Inventory (as of Oct 2026); town limits: U.S. Census Bureau TIGER/Line places; sales: the county's own file, through Sep 2026; counted on our map built Oct 2026.