Rochester, IL Profile: Facts & Data

Rochester, Illinois - Basic Facts

The Village of Rochester had a population of 3,857 as of July 1, 2025.

The primary coordinate point for Rochester is located at latitude 39.7495 and longitude -89.5318 in Sangamon County. The formal boundaries for the Village of Rochester encompass a land area of 2.43 sq. miles and a water area of 0 sq. miles. Sangamon County is in the Central time zone (GMT -6).

The Village of Rochester has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The Village of Rochester is located within Township of Rochester, a minor civil division (MCD) of Sangamon County.

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Rochester, IL Data & Demographics (As of July 1, 2025)

POPULATION
Total Population	3,857 (100%)
Population in Households	3,857 (100.0%)
Population in Families	3,247 (84.2%)
Population in Group Quarters¹	0
Population Density	1,438
Diversity Index²	18


INCOME
Median Household Income	$114,324
Average Household Income	$146,962
% of Income for Mortgage⁴	17%
Per Capita Income	$57,040
Wealth Index⁵	156
Socioeconomic Status Index⁶	High (69.2)

HOUSING
Total HU (Housing Units)	1,558 (100%)
Owner Occupied HU	1,350 (86.6%)
Renter Occupied HU	147 ( 9.4%)
Vacant Housing Units	61 ( 3.9%)
Median Home Value	$305,839
Average Home Value	$331,641
Housing Affordability Index³	120

HOUSEHOLDS
Total Households	1,497
Average Household Size	2.58
Family Households	1,125
Average Family Size	3.00

HOUSING

Total HU (Housing Units)

1,558 (100%)

Owner Occupied HU

1,350 (86.6%)

Renter Occupied HU

147 ( 9.4%)

Vacant Housing Units

61 ( 3.9%)

Median Home Value

$305,839

Average Home Value

$331,641

Housing Affordability Index³

120

HOUSEHOLDS

Total Households

1,497

Average Household Size

2.58

Family Households

1,125

Average Family Size

3.00

NOTES

Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.
The Socioeconomic Index ranges from zero (lowest relative status) to 100 (highest relative status). This measure quantifies disparities in social position of an area's inhabitants and is built from a broad range of demographic, housing, and socioeconomic inputs. More information on this measure can be found in Esri's SEI tutorial.

GROWTH RATE / YEAR	2020-2025	2025-2030
Population	-0.03%	-0.16%
Households	0.48%	0.16%
Families		0.18%
Median Household Income		1.84%
Per Capita Income		2.15%
Owner Occupied HU		-0.01%

GROWTH RATE / YEAR

2020-2025

2025-2030

Population

-0.03%

-0.16%

Households

0.48%

0.16%

Families

0.18%

Median Household Income

1.84%

Per Capita Income

2.15%

Owner Occupied HU

-0.01%

Rochester, IL - Peer Comparisons by Rank and Percentile

The table below compares Rochester to the other 1,461 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2025 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description	Rank	Percentile
Total Population	# 383	74th
Population Density	# 431	71st
Median Household Income	# 164	89th
Housing Affordability Index	# 644	44th
Per Capita Income	# 150	90th
Diversity Index	# 867	41st

Variable Description

Rank

Percentile

Total Population

# 383

74th

Population Density

# 431

71st

Median Household Income

# 164

89th

Housing Affordability Index

# 644

44th

Per Capita Income

# 150

90th

Diversity Index

# 867

41st

Illinois Census Data Comparison Tool

Rochester, IL Profile: Facts & Data

Rochester, Illinois - Basic Facts

Rochester, IL Data & Demographics (As of July 1, 2025)

POPULATION

INCOME

HOUSING

HOUSEHOLDS

GROWTH RATE / YEAR

Rochester, IL - Peer Comparisons by Rank and Percentile

Rochester, IL - Most Popular Things to Do

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Sangamon County