Boundary Atlas

Montclair, California

Montclair is a city in San Bernardino County, California, with 37,865 residents in 2020. It spans 2 congressional districts: CA-31 (95%) and CA-35 (4.6%). Its state senate district is State Senate District 22; its state house district is Assembly District 53.

37,865residents (2020 Census)
5.5 sq miland area
2ZIP codes
2congressional districts

County

CountyShare of residents
San Bernardino County100%

Congressional districts

Congressional districtShare of residents
California's 31st congressional district (CA-31)95%
California's 35th congressional district (CA-35)4.6%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (CA-31)Gilbert Ray Cisneros, Jr. (D)202-225-525695%
U.S. Representative (CA-35)Norma J. Torres (D)202-225-61614.6%
U.S. SenatorAdam B. Schiff (D)202-224-3841statewide
U.S. SenatorAlex Padilla (D)202-224-3553 · contact formstatewide
State Senator (State Senate District 22)Susan Rubio (Democratic)909-460-6064100%
Assembly Member (Assembly District 53)Michelle Rodriguez (Democratic)909-902-9606100%

Elected in 2024 under CA's previous congressional map; this district's lines changed for the 120th Congress (seated January 3, 2027).

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

State legislative districts

State senate districtShare of residents
State Senate District 22100%

State house districtShare of residents
Assembly District 53100%

ZIP codes

Percentages mark ZIPs only partly in Montclair: the share of that ZIP's residents living in it.

Get this in your AI agent

Your agent can get Montclair's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:

related_geographies(id="us:place:0648788")

Montclair 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.