Saint Elmo, IL Profile: Facts & Data


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Saint Elmo, Illinois - Basic Facts

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The City of Saint Elmo had a population of 1,437 as of July 1, 2021. Saint Elmo ranks in the lower quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Saint Elmo is located at latitude 39.0273 and longitude -88.8481 in Fayette County. The formal boundaries for the City of Saint Elmo encompass a land area of 1.19 sq. miles and a water area of 0.02 sq. miles. Fayette County is in the Central time zone (GMT -6). The elevation is 617 feet.

The City of Saint Elmo 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 City of Saint Elmo is located within Township of Avena, a minor civil division (MCD) of Fayette County.

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  1. Saint Elmo 2021 Demographic Data
  2. Growth Rates for Saint Elmo (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Illinois Research Tools (Easy Tools & Current Data)
  3. Illinois Data Comparison Tool - 2021 Demographics

Saint Elmo, IL Data & Demographics (As of July 1, 2021)


Total Population 1,437 (100%)
Population in Households 1,406 (97.8%)
Population in Families 1,136 (79.1%)
Population in Group Quarters1 31 ( 2.2%)
Population Density 1,137
Diversity Index2 6


Median Household Income $41,695
Average Household Income $51,703
% of Income for Mortgage4 9%
Per Capita Income $20,482
Wealth Index5 43


Total HU (Housing Units) 632 (100%)
Owner Occupied HU 458 (72.5%)
Renter Occupied HU 108 (17.1%)
Vacant Housing Units 66 (10.4%)
Median Home Value $86,207
Average Home Value $116,430
Housing Affordability Index3 253


Total Households 566
Average Household Size 2.48
Family Households 384
Average Family Size 3
  1. 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.
  2. 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.
  3. 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.
  4. 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).
  5. 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.


2010-2021 2021-2026
Population 0.07% -0.34%
Households 0.24% -0.28%
Families 0.21% -0.37%
Median Household Income   1.25%
Per Capita Income   2.11%
Owner Occupied HU   -0.13%

Saint Elmo, IL - Peer Comparisons by Rank and Percentile

The table below compares Saint Elmo to the other 1,369 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2021 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 # 601 56th
Population Density # 647 53rd
Median Household Income # 1271 7th
Housing Affordability Index # 873 64th
Per Capita Income # 1313 4th
Diversity Index # 1232 10th

Additional comparisons and rankings can be made with a VERY EASY TO USE Illinois Census Data Comparison Tool.

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