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Where am ILOCATED

Lake County, Illinois

Lake County, Illinois, has 719,339 residents (July 2025 estimate). Its county seat is Waukegan. It uses Central Time and covers 444 sq mi (1,149 km²) of land.

ChicagoAurora
Lake County in Illinois
WaukeganBuffalo GroveWheelingMundeleinNorth Chicago
Lake County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
719,339
Land area
444 sq mi (1,149 km²)
County seat or government
Waukegan
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$110,416 ± $1,747
Median home value
$345,700 ± $3,502
Median rent, with utilities
$1,477 ± $29
Homes lived in by their owners
74.8% ± 0.6 points
County type
County
Metro or micro area
Chicago-Naperville-Elgin, IL-IN metro areaCentral county
Water area
925 sq mi (2,395 km²)
State
Illinois
County code (FIPS)
17097
Coordinates (central point)
42.185968, -87.805939
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in Lake County

Time zoneLocal time and UTC offsetNext clock change
Central TimeAmerica/ChicagoUTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 6008572,341 people
  2. 6007362,868 people
  3. 6001045,747 people
  4. 6004744,240 people
  5. 6008942,872 people
  6. 6009038,298 people
  7. 6006037,344 people
  8. 6003137,107 people
  9. 6007436,460 people
  10. 6003035,792 people
  11. 6004634,613 people
  12. 6005031,781 people
All 36
  1. 6009930,881 people
  2. 6003530,398 people
  3. 6004829,124 people
  4. 6001528,096 people
  5. 6006127,974 people
  6. 6008727,293 people
  7. 6001326,694 people
  8. 6005124,621 people
  9. 6000224,232 people
  10. 6004521,074 people
  11. 6008417,192 people
  12. 6006414,884 people
  13. 6008814,400 people
  14. 6002010,970 people
  15. 6004410,312 people
  16. 600839,981 people
  17. 600819,088 people
  18. 600419,024 people
  19. 600698,502 people
  20. 600428,347 people
  21. 600966,527 people
  22. 600405,301 people
  23. 600214,996 people
  24. 60075129 people

36 ZIP Code areas overlap Lake County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

Lake County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in Lake County, largest first

  1. Waukegan Township89,689 people
  2. Vernon Township71,411 people
  3. Warren Township65,562 people
  4. Avon Township63,428 people
  5. Libertyville Township54,192 people
  6. Ela Township45,717 people
  7. Lake Villa Township39,760 people
  8. Shields Township37,623 people
  9. Moraine Township34,354 people
  10. Fremont Township33,607 people
  11. West Deerfield Township31,575 people
  12. Grant Township28,189 people
All 18
  1. Antioch Township27,680 people
  2. Zion Township24,600 people
  3. Wauconda Township23,911 people
  4. Benton Township18,857 people
  5. Cuba Township17,272 people
  6. Newport Township6,796 people

People counts are American Community Survey 2020–2024 5-year estimates. All townships in Illinois, by county

School districts in Lake County, largest first

  1. Community High School District 15598,431 people
  2. Waukegan Community Unit School District 6082,393 people
  3. Warren Township High School District 12169,669 people
  4. Adlai E. Stevenson High School District 12566,357 people
  5. Township High School District 11359,604 people
  6. Woodland Community Consolidated School District 5051,112 people
  7. Libertyville Community High School District 12850,619 people
  8. Antioch Community High School District 11746,033 people
  9. Mundelein Consolidated High School District 12044,837 people
  10. Zion-Benton Township High School District 12644,775 people
  11. Barrington Community Unit School District 22044,738 people
  12. Grayslake Community High School District 12743,585 people
All 50
  1. McHenry Community Consolidated School District 1542,417 people
  2. Grant Community High School District 12437,904 people
  3. North Shore School District 11236,390 people
  4. Round Lake Community Unit School District 11635,039 people
  5. Lake Zurich Community Unit School District 9531,909 people
  6. Hawthorn Community Consolidated School District 7331,127 people
  7. Grayslake Consolidated Community School District 4629,973 people
  8. Wauconda Community Unit School District 11828,883 people
  9. Lake Forest Community High School District 11528,717 people
  10. North Chicago School District 18727,939 people
  11. Kildeer Countryside Community Consolidated School District 9624,372 people
  12. Lake Villa Community Consolidated School District 4124,118 people
  13. Antioch Community Consolidated School District 3423,148 people
  14. Cary Community Consolidated School District 2622,250 people
  15. Fremont School District 7921,312 people
  16. Deerfield School District 10921,162 people
  17. Aptakisic-Tripp Community Consolidated School District21,123 people
  18. Beach Park Community Consolidated School District 320,901 people
  19. Lake Forest School District 6719,013 people
  20. Gurnee School District 5618,463 people
  21. Libertyville School District 7018,310 people
  22. Zion Elementary School District 617,704 people
  23. Big Hollow School District 3815,908 people
  24. Mundelein Elementary School District 7515,359 people
  25. Lincolnshire-Prairieview School District 10314,110 people
  26. Nippersink School District 211,654 people
  27. Richmond-Burton Community High School District 15711,654 people
  28. Lake Bluff Elementary School District 659,329 people
  29. Millburn Community Consolidated School District 249,091 people
  30. Gavin School District 378,655 people
  31. Diamond Lake School District 768,607 people
  32. Fox Lake Grade School District 1148,352 people
  33. Oak Grove School District 68 (Lake County)7,723 people
  34. Winthrop Harbor School District 16,170 people
  35. Emmons School District 333,339 people
  36. Grass Lake School District 362,485 people
  37. Bannockburn School District 1062,064 people
  38. Rondout School District 721,933 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Waukegan, Illinois (city)89,076 people
  2. Buffalo Grove, Illinois (village)42,891 people
  3. Wheeling, Illinois (village)38,433 people
  4. Mundelein, Illinois (village)31,915 people
  5. North Chicago, Illinois (city)30,643 people
  6. Gurnee, Illinois (village)30,510 people
  7. Highland Park, Illinois (city)30,398 people
  8. Round Lake Beach, Illinois (village)27,079 people
  9. Vernon Hills, Illinois (village)26,876 people
  10. Zion, Illinois (city)24,600 people
  11. Grayslake, Illinois (village)20,929 people
  12. Libertyville, Illinois (village)20,525 people
All 61
  1. Lake Zurich, Illinois (village)19,832 people
  2. Deerfield, Illinois (village)19,518 people
  3. Lake Forest, Illinois (city)19,416 people
  4. Round Lake, Illinois (village)18,628 people
  5. Antioch, Illinois (village)14,859 people
  6. Lindenhurst, Illinois (village)14,417 people
  7. Beach Park, Illinois (village)14,115 people
  8. Wauconda, Illinois (village)14,027 people
  9. Fox Lake, Illinois (village)11,131 people
  10. Barrington, Illinois (village)11,077 people
  11. Gages Lake, Illinois (CDP)10,819 people
  12. Hawthorn Woods, Illinois (village)9,143 people
  13. Lake Villa, Illinois (village)8,683 people
  14. Long Grove, Illinois (village)8,305 people
  15. Island Lake, Illinois (village)8,014 people
  16. Lincolnshire, Illinois (village)7,980 people
  17. Round Lake Park, Illinois (village)7,919 people
  18. Park City, Illinois (city)7,827 people

See all 61 cities, towns and communities in Lake County, largest first

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Cook County, Illinois22 mi south
  2. Kenosha County, Wisconsin28 mi north
  3. McHenry County, Illinois34 mi west
  4. Berrien County, Michigan61 mi southeast
  5. Van Buren County, Michigan77 mi east
  6. Allegan County, Michigan81 mi east

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.