Marathon County, Wisconsin

Marathon County covers 1,545 square miles of land. Below is what the Isopleth API returned at the Census Bureau's interior point for the county (44.89804, -89.75782) on 2026-10-29. The ground sits at 412 m (1,350 ft) on a 3.9° slope, the mapped soil is somewhat poorly drained, it is outside a mapped FEMA floodplain, the nearest 69 kV+ substation is 7.1 km (4.4 mi) away and a major road is 407 m away. Values describe that one point, not the whole county; look up your own address or coordinates for your site.

Sample point values

Fields with no data at this point are left out. See the field catalog for all 351 fields.

Parcels

Parcel records: 3,574,638 parcels in 72 counties. Marathon County has 83,713 of them. Published by Wisconsin State Cartographer's Office / WLIP at DOA (Public, attribution); V12 (2026 release; tax roll 2025), refreshed annual.

Share of parcels with each column filled: owner name 98%, site address 70%, total value 88%, land use 88%. Not published here: sale date, zoning, year built.

The parcel under the sample point is 38.9 acres; its public record includes owner name, mailing address, total value, land value, land-use code. parcel_enrich returns that record for any parcel you ask about, and parcel_search finds parcels by acreage, land use or value.

Look up your own site

curl https://api.isopleth.dev/v1/fetch -H "Authorization: Bearer $ISOPLETH_KEY" \
  -H "Content-Type: application/json" \
  -d '{"lat": 44.898036, "lng": -89.757823, "preset": "site_selection"}'

Or ask your assistant through the MCP server: “Using Isopleth, check flood zone, wetlands, soils and distance to power for [your address in Marathon County, Wisconsin].”

Buying land here? Check the Land’s Marathon County page shows what its $29 report checks, built on these same Isopleth fields.

More in Wisconsin: Bayfield County · Marinette County · Wisconsin overview · all states