Lake Petersburg is a community in Menard County, Illinois, home to about 928 people across 1.8 square miles. It has no ZIP code of its own: it’s part of 62675.
Homes sold for a median of $133 per square foot in the three months ending August 2026, a seller’s market.
Mostly Petersburg; part is in Lake Petersburg
Each card is that ZIP code’s whole market, including any part outside Lake Petersburg. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Lake Petersburg’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | St. Louis Lambert International Airport (STL)92 miles away |
|---|---|
| Closer regional airport | Abraham Lincoln Capital Airport (SPI)15 miles away |
| Nearest city of 250,000+ | St. Louis, MO97 miles away |
| Nearest city of 1 million+ | Chicago, IL169 miles away |
Straight-line distances from the center of Lake Petersburg; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Lake Petersburg had 740 residents in the 2020 census, up 3% since 2010.
It’s the 722nd largest of 1,450 towns in Illinois by population.
Menard County grew from 14,336 residents in 1900 to 12,297 in 2020.
Menard County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 86°F in summer, and winter lows average 17°F. About 37.7 inches of rain and melted snow fall in a typical year, with about 15 inches of snow.
Source: NOAA 1991–2020 climate normals, Petersburg 1e, IL weather station (about a mile away).
1,216 jobs at 207 businesses in Menard County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
22 doctors and other health care providers list an office in Lake Petersburg.
Nearest hospitals
Providers with an office here
| Primary care doctors | 6 |
|---|---|
| Dentists | 1 |
| Nurse practitioners and physician assistants | 3 |
| Mental health providers | 7 |
| Physical and occupational therapists | 2 |
| Chiropractors | 3 |
| Pharmacies | 4 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (4 nearby)
Grocery stores (1 nearby)
Libraries (1 nearby)
Museums (1 nearby)
Theaters and performance venues
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Porta CUSD 202. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Petersburg Elem SchoolPetersburg | Pre-K–2 | 335 | Public | 0.4 mi |
| Porta CentralPetersburg | 3–6 | 288 | Public | 0.7 mi |
| Porta High SchoolPetersburg | 7–12 | 411 | Public | 0.8 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Petersburg.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.