Electric companies in Williamson County, Illinois
Williamson County, IL ranks 3rd of 102 Illinois counties for damaging wind risk, FEMA score 99.1. Williamson County, IL has 66,902 residents. Williamson County, IL: 3 utilities listed by EIA.
Households in Williamson County can pick a supplier. See how to compare suppliers.
Williamson County, IL on the map
Williamson County, IL darker: more storm events
Electric utilities in Williamson County, IL
| Utility listed for Williamson County, IL | Type | Home accounts in Illinois |
|---|---|---|
| Ameren Illinois Company in Williamson County, IL | Investor Owned | 1,060,894 |
| Southeastern IL Elec Coop, Inc in Williamson County, IL | Cooperative | 22,731 |
| Egyptian Electric Coop Assn in Williamson County, IL | Cooperative | 13,707 |
Plans from retail suppliers are not in public data, so no plan prices are shown. The listed utilities deliver the power, and which one serves your street depends on the address.
Outage risk in Williamson County, IL
Williamson County, IL, NWS storm events 2015 to 2025: 176 in all, 263.1 per 100,000 residents of 66,902, rank 17 of 102 Illinois counties. Property damage in Williamson County, IL: $27.0M, with 22 direct injuries or deaths.
Events by year in Williamson County, IL
events a year, Williamson County, IL
- 13'15
- 8'16
- 16'17
- 21'18
- 16'19
- 7'20
- 9'21
- 14'22
- 25'23
- 26'24
- 21'25
Events by type
| Williamson County, IL | FEMA | Score | Rank | Events | Peak | Damage |
|---|---|---|---|---|---|---|
| Williamson County, IL, thunderstorm and high wind | Very High | 99.1 | 3 of 102 | 98 | 2023 (17) | $863K |
| Williamson County, IL, tornado | Relatively Moderate | 80.3 | 23 of 102 | 11 | 2018 (4) | $25.8M |
| Williamson County, IL, hurricane and tropical storm | Very Low | 44.5 | 5 of 102 | 0 | none | $0 |
| Williamson County, IL, ice storm | Relatively Moderate | 81.9 | 5 of 102 | 2 | 2017 (1) | $335K |
| Williamson County, IL, winter storm and heavy snow | Relatively High | 89.8 | 9 of 102 | 15 | 2015 (3) | $5K |
| Williamson County, IL, heat wave | Relatively Moderate | 90.7 | 12 of 102 | 50 | 2024 (7) | $0 |
Housing and heating in Williamson County, IL
Williamson County, IL: 15,696 of 31,957 homes were built before 1980 and 8,535 in 2000 or later. Williamson County, IL has 23,610 detached houses, 1,670 homes in 5+ unit buildings, 2,366 mobile homes, and 8,307 of 28,774 households rent.
Age of homes in Williamson County, IL
% of homes by decade built, Williamson County, IL
- 14pre-40
- 540s
- 650s
- 960s
- 1470s
- 1180s
- 1390s
- 1500s
- 1110s
- 120+
Heating fuel in Williamson County, IL
| Williamson County, IL | Value | State median | Gap | Rank (1 = highest) |
|---|---|---|---|---|
| Williamson County, IL, median year built | 1981 | 1969 | +12 years | 11 of 102 |
| Williamson County, IL, built before 1980 | 49.1% | 66.6% | -17.5 points | 92 of 102 |
| Williamson County, IL, built 2000 or later | 26.7% | 14.2% | +12.5 points | 9 of 102 |
| Williamson County, IL, detached houses | 73.9% | 78.6% | -4.7 points | 75 of 102 |
| Williamson County, IL, apartments in 5+ unit buildings | 5.2% | 5.4% | -0.1 points | 53 of 102 |
| Williamson County, IL, mobile homes | 7.4% | 5.6% | +1.8 points | 41 of 102 |
| Williamson County, IL, renter households | 28.9% | 23.2% | +5.7 points | 20 of 102 |
| Williamson County, IL, median home value | $145,600 | $126,000 | +$19,600 | 37 of 102 |
| Williamson County, IL, median gross rent a month | $897 | $793 | +$104 | 26 of 102 |
| Williamson County, IL, people per household | 2.25 | 2.35 | -0.10 | 89 of 102 |
Cost of living with electricity in Williamson County, IL
Williamson County, IL: electricity $1,775 a year per home (DOE LEAD), all home energy $2,221, 2.9% of $77,877 income. 28,521 households in Williamson County, IL spend about $50.6 million a year on electricity and $63.3 million on all home energy. Lower-income homes in Williamson County, IL ($24,045 a year) spend 8.1% of income, 2.8 times the all-home figure.
Energy burden in Williamson County, IL
| Williamson County, IL | Homes | Income | Power | Gas | Other | Burden |
|---|---|---|---|---|---|---|
| Williamson County, IL, all households | 28,521 | $77,877 | $1,775 | $424 | $22 | 2.9% |
| Williamson County, IL, lower income | 10,178 | $24,045 | $1,577 | $353 | $20 | 8.1% |
| Williamson County, IL, owners | 20,237 | $92,523 | $1,978 | $536 | $27 | 2.8% |
| Williamson County, IL, renters | 8,284 | $42,097 | $1,279 | $150 | $9 | 3.4% |
Flood claims and flood insurance in Williamson County, IL
Williamson County, IL: 26 NFIP flood claims in 2015 to 2025, $392K paid, median paid claim $5,639.
141 of 29,524 residential structures in Williamson County, IL carry an NFIP contract. 160 NFIP policies of any type were in force in Williamson County, IL on 8 Sep 2026. Williamson County, IL lists 13 repetitive-loss properties.
Williamson County, IL: claims history, not an outage count.
Flood claims by year in Williamson County, IL
flood claims a year, Williamson County, IL
- 0'15
- 0'16
- 20'17
- <5'18
- 0'19
- 0'20
- <5'21
- <5'22
- <5'23
- 0'24
- 0'25
| Williamson County, IL | Value | Median county | Rank (1 = highest) |
|---|---|---|---|
| Williamson County, IL, claims 2015-2025 | 26 | — | 29 of 61 |
| Williamson County, IL, paid 2015-2025 | $392K | — | 33 of 61 |
| Williamson County, IL, median paid claim | $5,639 | — | — |
| Williamson County, IL, claims per 1,000 homes | 0.9 | 1.1 | 40 of 61 |
| Williamson County, IL, homes with flood insurance | 0.5% | 0.3% | 40 of 99 |
| Williamson County, IL, policies in force | 160 | — | — |
| Williamson County, IL, repetitive-loss properties | 13 | — | — |
Williamson County, IL: OpenFEMA NFIP, claims as of 8 Sep 2026, insured share as of 3 Aug 2026; counts under 5 are hidden.
Williamson County, IL: flood claims by state, flood hub.
Climate and electric heating in Williamson County, IL
Williamson County, IL totals 4,477 heating degree days and 1,356 cooling degree days a year (1991-2020 normal).
For heating, Williamson County, IL is the 93rd coldest of 102 counties in Illinois: 4,477 against a median of 5,457. For cooling, Williamson County, IL is the 18th hottest: 1,356 against a median of 1,112.
Williamson County, IL runs furnace and air conditioner, 3,121 degree days apart.
Williamson County, IL: 4,262 heating degree days in 2016-2025, 4,477 on the normal, 5% under.
Williamson County, IL: electricity heats 66.0% of 28,774 homes, in a county with 4,477 heating degree days in a normal year.
| Williamson County, IL | Value | IL median county | Williamson County, IL, rank (1 = highest) |
|---|---|---|---|
| Williamson County, IL, heating degree days, 1991-2020 normal | 4,477 | 5,457 | 93 of 102 |
| Williamson County, IL, heating degree days, 2016-2025 mean | 4,262 | 5,201 | 90 of 102 |
| Williamson County, IL, cooling degree days, 1991-2020 normal | 1,356 | 1,112 | 18 of 102 |
| Williamson County, IL, cooling degree days, 2016-2025 mean | 1,428 | 1,200 | 25 of 102 |
| Williamson County, IL, electric heating, ACS 2019-2023 | 66.0% | 22.2% | 1 of 102 |
Williamson County, IL: ACS B25040, 28,774 homes; NOAA nClimDiv, retrieved 7 Oct 2026.
Facts about Williamson County, IL
- Residents of Williamson County, IL, ACS 2023
- 66,90222 of 102 Illinois counties
- Households in Williamson County, IL
- 28,7742.33 people each
- Owner-occupied homes in Williamson County, IL
- 71.1%20,467 owner and 8,307 renter households
- Median household income in Williamson County, IL
- $65,52150 of 102 Illinois counties
- Housing units in Williamson County, IL
- 31,9573,183 vacant or seasonal, 10.0% of the units
- Homes heated by electricity in Williamson County, IL
- 66.0%18,996 homes, 1 of 102 Illinois counties
- Utilities listed for Williamson County, IL
- 33 with a home price: Ameren Illinois Company, Southeastern IL Elec Coop, Inc, Egyptian Electric Coop Assn
- ZIP areas touching Williamson County, IL
- 1562841 to 62974
- Outage-linked storm events in Williamson County, IL
- 176NWS storm events, 2015 to 2025
- Homes built before 1980 in Williamson County, IL
- 49.1%median year built 1981
- Flood claims in Williamson County, IL
- 26NFIP 2015 to 2025, $392K paid
- Home energy burden in Williamson County, IL
- 2.9%$1,775 a year on electricity (DOE LEAD)
Electricity price since 2015 in Williamson County, IL
Williamson County, IL has no price series of its own. Williamson County, IL: the Illinois average was 12.50 ¢/kWh in 2015. Williamson County, IL: 15.87 ¢ in 2024, 27% up. Williamson County, IL: against 30% up for the U.S. average.
Williamson County, IL: a 693 kWh month at the Illinois price. Williamson County, IL: $87 in 2015, $110 in 2024. Williamson County, IL: $1,320 a year, 2.0% of the $65,521 median income.
Williamson: 10 yearly prices
| Year | Illinois average | Williamson: Gap to U.S. average |
|---|---|---|
| 2015, Williamson | 12.50 | -0.15 |
| 2016, Williamson | 12.54 | -0.01 |
| 2017, Williamson | 12.95 | +0.06 |
| 2018, Williamson | 12.77 | -0.10 |
| 2019, Williamson | 13.03 | +0.02 |
| 2020, Williamson | 13.04 | -0.11 |
| 2021, Williamson | 13.18 | -0.48 |
| 2022, Williamson | 15.65 | +0.61 |
| 2023, Williamson | 15.71 | -0.29 |
| 2024, Williamson | 15.87 | -0.61 |
Williamson County, IL: EIA-861 home prices, 2015 to 2024, not a Williamson County, IL price.
CSVAnalyst note on Williamson County, IL
18,996 of the 28,774 homes in Williamson County, IL heat with electricity. Williamson County, IL counts 66,902 residents in 28,774 households. Williamson County, IL touches 15 ZIP areas, 62841 to 62974, about 4,460 residents each.
Household income in Williamson County, IL is $65,521; 20,467 of its 28,774 households own. Williamson County, IL has 31,957 housing units, 3,183 (10.0%) vacant or seasonal, and 8,307 rented homes. Williamson County, IL logged 176 storm events for its 66,902 residents.
The median home in Williamson County, IL dates from 1981. Homes in Williamson County, IL pay $1,775 a year for electricity.
Bill and heat pump calculator, Williamson County, IL
Compare Williamson County, IL with its neighbours
- Franklin County sits 16 miles north of Williamson County, IL, with 37,541 residents against 66,902 there, 151 storm events against 176, median home built 1965 against 1981, energy burden 3.8% against 2.9%, income $53,471 against $65,521.
- Johnson County sits 23 miles south of Williamson County, IL, with 13,350 residents against 66,902 there, 119 storm events against 176, median home built 1985 against 1981, energy burden 3.5% against 2.9%, income $65,203 against $65,521.
- Saline County sits 22 miles east of Williamson County, IL, with 23,387 residents against 66,902 there, 136 storm events against 176, median home built 1970 against 1981, energy burden 3.4% against 2.9%, income $54,945 against $65,521.
- Perry County sits 27 miles northwest of Williamson County, IL, with 20,810 residents against 66,902 there, 133 storm events against 176, median home built 1973 against 1981, energy burden 3.7% against 2.9%, income $59,286 against $65,521.
- Hamilton County sits 32 miles northeast of Williamson County, IL, with 7,972 residents against 66,902 there, 120 storm events against 176, median home built 1971 against 1981, energy burden 4.2% against 2.9%, income $61,520 against $65,521.
ZIP codes in Williamson County, IL
- 62841
- 62890
- 62902
- 62915
- 62917
- 62918
- 62921
- 62922
- 62933
- 62948
- 62949
- 62951
- 62958
- 62959
- 62974
Illinois: home prices since 2001, planned plants.
Questions on Williamson County, IL
Williamson County, IL: what do homes pay for electricity?
No single price in Williamson County, IL: 3 utilities deliver power and homes pick a plan. Illinois average 15.87 cents per kWh, $110 a month at 693 kWh.
Williamson County, IL: how many homes heat with electricity?
Williamson County, IL: 18,996 of 28,774 occupied homes, 66.0%, rank 1 of 102.
Williamson County, IL: median household income?
$65,521 in Williamson County, IL, rank 50 of 102; 66,902 residents, 28,774 households.
Williamson County, IL: outage-linked storms since 2015?
Williamson County, IL: 176 NWS events, peak year 2024.
Williamson County, IL: flood insurance claims since 2015?
Williamson County, IL: 26 NFIP flood claims, $392K paid, 0.9 per 1,000 homes, 0.5% of homes insured.
How old are the homes in Williamson County, IL?
Williamson County, IL: median home built 1981; 49.1% predate 1980, 73.9% detached, 5.2% in 5+ unit buildings.
Williamson County, IL: share of income for energy?
Williamson County, IL homes spend $1,775 a year on electricity, $2,221 on all energy: 2.9% of $77,877; 8.1% for lower incomes.