Hillsboro, Missouri
Hillsboro is a city in Jefferson County, Missouri, with 3,473 residents in 2020. It is in Missouri's 3rd congressional district. It spans 2 state house districts. Its state senate district is State Senate District 3.
County
| County | Share of residents |
|---|---|
| Jefferson County | 100% |
Congressional district
| Congressional district | Share of residents |
|---|---|
| Missouri's 3rd congressional district (MO-03) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MO-03) | Robert F. Onder, Jr. (R) | 202-225-2956 | 100% |
| U.S. Senator | Eric Schmitt (R) | 202-224-5721 · contact form | statewide |
| U.S. Senator | Josh Hawley (R) | 202-224-6154 · contact form | statewide |
| State Senator (State Senate District 3) | Mike Henderson (R) | 100% | |
| State Representative (State House District 111) | Cecelie Williams (R) | 99% | |
| State Representative (State House District 115) | Bill Lucas (R) | 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
- Hillsboro website: http://www.hillsboromo.org/
- Hillsboro laws: search for the Hillsboro, Missouri code of ordinances
- Jefferson County website: http://www.jeffcomo.org
- Jefferson County laws: search for the Jefferson County, Missouri code of ordinances
State legislative districts
| State senate district | Share of residents |
|---|---|
| State Senate District 3 | 100% |
| State house district | Share of residents |
|---|---|
| State House District 111 | 99% |
| State House District 115 | 0.5% |
ZIP codes
Percentages mark ZIPs only partly in Hillsboro: the share of that ZIP's residents living in it.
Get this in your AI agent
Your agent can get Hillsboro'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:2932248")
Hillsboro 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.