Clay County
Parcel & Property Data
About This Data
LandBrief holds 18,609 parcel records for Clay County, sourced from county records. Each includes the parcel boundary, and — where the county publishes them — owner, situs address, acreage, assessed values and legal description.
Data from the Clay County assessor roll dated October 2022, loaded August 2026. See data sources for every county’s vintage.
Explore Clay County
Clay County by the Numbers
- Median parcel size
- 14.1 acres
measured from mapped boundaries - 90th-percentile parcel
- 40 acres
- County land area
- 363,032 acres
U.S. Census measurement - Communities
- 11
61.8% of parcels outside any incorporated place
Who Owns Clay County?
Share of the county’s 18,609 parcels by the kind of owner on record. Classified from owner names, so the boundaries are approximate; an entity the rules cannot place counts as an individual.
| Owner type | Share of parcels |
|---|---|
| Individuals | 67.7% |
| Companies & organizations | 15.8% |
| Trusts & estates | 13.0% |
| Government | 3.0% |
| Other / unclassified | 0.4% |
The largest owner on record is City of Spencer with 165 parcels — see the full landowner leaderboard.
Parcel Records (~18,609 total)
| Parcel ID | Owner | Address | City | Acreage |
|---|---|---|---|---|
| 973525200001 | State of Iowa | 3120 330TH AVE LAKE | Unincorporated | 369.55 |
| 973525400005 | Mud Lake Fur Farm | 330TH AVE LAKE | Unincorporated | 169.40 |
| 943525300001 | State of Iowa | 330TH AVE GARFIELD | Unincorporated | 161.30 |
| 963703400005 | City of Spencer | 200TH AVE SPENCER | Spencer | 156.81 |
| 963703300007 | City of Spencer | 190TH AVE RIVERTON | Unincorporated | 153.50 |
| 963619304004 | City of Spencer | 1320 4TH AVE SW SPENCER | Spencer | 148.70 |
| 963617300007 | Clay County, IA | 420 10TH AVE SE SPENCER | Spencer | 132.53 |
| 973517300010 | State of Iowa | 300TH ST LAKE | Unincorporated | 126.00 |
| 963703200008 | City of Spencer | 1957 330TH ST SPENCER | Spencer | 121.13 |
| 963701400007 | Clay County Fair Association | W 18TH ST SPENCER | Spencer | 121.00 |
Download Clay County parcel data
All 18,609 parcels in Clay County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.
Get Clay County on FreeParcelData →Nearby counties
Frequently Asked Questions
How many parcels are in Clay County?
The Clay County assessor roll on file records 18,609 parcels across 11 communities, with 61.8% lying outside any incorporated place.
Who owns the most land in Clay County?
City of Spencer holds 165 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.
What is the typical parcel size in Clay County?
Measured from mapped boundaries, the median parcel is 14.1 acres, and nine parcels in ten are under 40 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.
How much of Clay County is government-owned?
Government entities — federal, state, and local — hold 3.0% of the county’s parcels, classified from owner names on the roll.
How current is this data?
It comes from the Clay County assessor roll dated October 2022. Counties deliver on their own schedules; the methodology page explains how records are processed and the data sources page tracks every county’s vintage.
Browse by City (11)
18,609 parcels across 11 communities in Clay County.