Rochester, IL land: flood and parcels
1,731 parcels
On the county tax roll
- Acres on the roll1,584
- In a FEMA flood zone6.6%special flood hazard area
Illinois 2026 taxes are billed in 2027: the first installment is due no earlier than June 1, 2027.
Sources: Illinois Property Tax Code 35 ILCS 200/21-15, 35 ILCS 200/21-25, 35 ILCS 200/21-30 and 35 ILCS 200/16-55. Checked Oct 13, 2026.
Free account: 25 parcel cards a day on the map, with sale history, road access and elevation. Get started free
Our map has no zoning layer for Rochester yet. Ask the village's or Sangamon County's planning office which zoning applies to a parcel.
Around Rochester
Flood zones and wetlands
People and new homes in Rochester
- Population4,093July 2025 estimate, +5.9% since 2020
- Median household income$117,1182020–2024 average, ±$10,859
- New homes permitted52025, 3 single-family; 30 in 2022
U.S. Census Bureau, Population Estimates Program, Vintage 2025 (May 2026); U.S. Census Bureau, American Community Survey 2020-2024 5-year (B19013) (Jan 2026); U.S. Census Bureau, Building Permits Survey (Sep 2026).
Illinois land market report · Illinois land prices by quarter
Land in Rochester by useLand use on the county roll
| Land class | Parcels | Share |
|---|---|---|
| Building on record | 1,500 | 87% |
| Other or not coded | 230 | 13% |
| Farm and timber | 1 | 0.1% |
1 farm and timber parcels cover 28 acres. County tax roll, as of 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 Rochester is 0.34 acre (1,731 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 RochesterFarm and timber parcels to start with
Farm and timber parcels of an acre or more, each with its own page of public roll facts.
Nearby townsTowns around it
Questions about Rochester landAnswers from the public records
How many parcels are in Rochester, IL?
1,731 parcels on the Sangamon County parcel layer (pulled Oct 2026), covering 1,584 acres.
Is vacancy verified in Rochester, IL?
Vacancy not verified: each parcel page says whether the county roll or building footprints show a building.
What is the typical lot size in Rochester?
The median parcel is 0.34 acre, from 1,731 parcels with a recorded size.
How much of Rochester is in a flood zone?
6.6% 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 Rochester?
0.9% of parcels are a quarter or more wetland on the USFWS National Wetlands Inventory, a mapping guide, not a legal delineation.
What is Rochester zoned?
Our map has no zoning layer for Rochester yet. Ask the village's or Sangamon County's planning office which zoning applies to a parcel.
How many people live in Rochester?
About 4,093 (Census estimate for July 1, 2025), +5.9% since 2020.
How many new homes are being built in Rochester?
Building permits authorized 5 new housing units in 2025 (Census Building Permits Survey).
Where does this data come from?
Parcels: Sangamon County parcels: Sangamon County GIS (layer as of Oct 2026). 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 Sangamon CountyIts other towns
About these numbersSources, dates and how these figures are built
Sources
Parcels: Sangamon County parcels: Sangamon County GIS (layer as of Oct 2026) (pulled 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.