Adams County land: flood and parcels
188,474 parcels
2.1% of Adams County’s 188,474 parcels are in a FEMA flood zone.
County roll 2026 · Map data Oct 26, 2026
- Acres on the roll721,995
- In a FEMA flood zone2.1%special flood hazard area
Property tax calendar
Colorado 2026 taxes: bills go out in January 2027; first half due March 1, 2027, second half June 15, 2027.
- First half
- March 1, 2027On the 2026 values; or pay the whole bill by April 30, 2027
- Second half
- June 15, 2027A late half accrues 1% interest a month
- Value protests
- To the assessor by June 8 (next working day when it falls on a weekend)Then to the county board of equalization
Free account: 25 parcel cards a day on the map, with watches and a saved search. Get started free
Around Adams County
Towns and census places in Adams County
- Thornton46,943 parcels
- Commerce City27,749 parcels
- Westminster23,460 parcels
- Aurora (Adams County part)20,453 parcels
- Brighton16,181 parcels
- Northglenn10,770 parcels
- Sherrelwood5,077 parcels
- Welby4,971 parcels
All 18 places
- Berkley3,928 parcels
- Twin Lakes3,321 parcels
- Bennett2,868 parcels
- Derby2,164 parcels
- Todd Creek2,039 parcels
- Shaw Heights1,686 parcels
- Federal Heights1,547 parcels
- Arvada (Adams County part)1,278 parcels
- North Washington963 parcels
- Strasburg951 parcels
Flood zones and wetlands
Recorded flood claims in Adams County
Fewer than 10 insured flood claims were recorded in Adams County since 1978.
Land in Adams County by useLand use on the county roll
| Land class | Parcels | Share |
|---|---|---|
| Building on record | 156,884 | 83% |
| Other or not coded | 19,562 | 10% |
| Institutional | 6,499 | 3.4% |
| Farm and timber | 5,529 | 2.9% |
5,529 farm and timber parcels cover 536,670 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 Adams County is 0.17 acre (186,864 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 Adams CountyFarm and timber parcels to start with
- 641.8 acres of farm and timber land
- 11950 Bradbury Krebs Rd 641.8 acres
- 641.8 acres of farm and timber land
- 641.6 acres of farm and timber land
- 641.6 acres of farm and timber land
- 641.3 acres of farm and timber land
- 641.2 acres of farm and timber land
- 641.0 acres of farm and timber land
Farm and timber parcels of an acre or more, each with its own page of public roll facts.
Questions about Adams County landAnswers from the public records
How many parcels are in Adams County, CO?
188,474 parcels on the 2026 Adams County tax roll (county file Oct 2026), covering 721,995 acres.
How much vacant land is in Adams County, 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 Adams County?
The median parcel is 0.17 acre, from 186,864 parcels with a recorded size.
How much of Adams County is in a flood zone?
2.1% 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 Adams County?
1.1% of parcels are a quarter or more wetland on the USFWS National Wetlands Inventory, a mapping guide, not a legal delineation.
Are there land prices for Adams County?
No land-price range is shown for Adams County 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.
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.
Recorded flood claims in Adams County
FEMA counts claims on buildings with NFIP flood insurance, so land without an insured building never shows here. Claims counted from 1978 to Sep 2026.
Source: OpenFEMA NFIP Redacted Claims v3, as of Sep 2026.
What Groundwork can price in Adams County
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); sales: the county's own file, through Sep 2026; counted on our map built Oct 2026.
This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data.