Buffalo Grove, Illinois
Buffalo Grove is a village in Lake County (68% of residents) and Cook County (32%), Illinois, with 43,126 residents in 2020. It spans 3 congressional districts: IL-09 (51%), IL-10 (44%) and IL-05 (5.6%). It spans 4 state senate and 4 state house districts.
County
| County | Share of residents |
|---|---|
| Lake County | 68% |
| Cook County | 32% |
Congressional districts
| Congressional district | Share of residents |
|---|---|
| Illinois's 9th congressional district (IL-09) | 51% |
| Illinois's 10th congressional district (IL-10) | 44% |
| Illinois's 5th congressional district (IL-05) | 5.6% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (IL-09) | Janice D. Schakowsky (D) | 202-225-2111 | 51% |
| U.S. Representative (IL-10) | Bradley Scott Schneider (D) | 202-225-4835 | 44% |
| U.S. Representative (IL-05) | Mike Quigley (D) | 202-225-4061 | 5.6% |
| U.S. Senator | Richard J. Durbin (D) | 202-224-2152 · contact form | statewide |
| U.S. Senator | Tammy Duckworth (D) | 202-224-2854 · contact form | statewide |
| State Senator (State Senate District 30) | Adriane Johnson (Democratic) | 847-672-6201 | 67% |
| State Senator (State Senate District 27) | Mark Walker (Democratic) | 847-749-1880 | 22% |
| State Senator (State Senate District 29) | Julie Morrison (Democratic) | 847-945-5200 | 10% |
| State Senator (State Senate District 26) | Darby Hills (R) | 224-662-4544 | 0.5% |
| State Representative (State House District 59) | Dan Didech (Democratic) | 847-478-9909 | 67% |
| State Representative (State House District 54) | Mary Beth Canty (Democratic) | 224-248-8187 | 22% |
| State Representative (State House District 57) | Tracy Katz Muhl (Democratic) | 847-715-9055 | 10% |
| State Representative (State House District 51) | Nabeela Syed (Democratic) | 773-916-6553 | 0.5% |
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Buffalo Grove website: https://www.vbg.org/
- Buffalo Grove laws: search for the Buffalo Grove, Illinois code of ordinances
- Lake County website: https://www.lakecountyil.gov/
- Lake County laws: search for the Lake County, Illinois code of ordinances
- Cook County website: https://www.cookcountyil.gov/
- Cook County laws: search for the Cook County, Illinois code of ordinances
State legislative districts
| State senate district | Share of residents |
|---|---|
| State Senate District 30 | 67% |
| State Senate District 27 | 22% |
| State Senate District 29 | 10% |
| State Senate District 26 | 0.5% |
| State house district | Share of residents |
|---|---|
| State House District 59 | 67% |
| State House District 54 | 22% |
| State House District 57 | 10% |
| State House District 51 | 0.5% |
ZIP codes
Percentages mark ZIPs only partly in Buffalo Grove: the share of that ZIP's residents living in it.
Get this in your AI agent
Your agent can get Buffalo Grove's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:place:1709447")
Buffalo Grove here is the Census Bureau's place boundary as of January 1, 2025. Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.