Atlantic, Iowa

Atlantic is a city in Cass County, Iowa, with 6,792 residents in 2020. It is in Iowa's 3rd congressional district. Its state senate district is State Senate District 9; its state house district is State House District 18.

6,792residents (2020 Census)

8.3 sq miland area

1ZIP codes

1congressional district

County

County	Share of residents
Cass County	100%

Congressional district

Congressional district	Share of residents
Iowa's 3rd congressional district (IA-03)	100%

Elected officials

Office	Member	Contact	Share of residents
U.S. Representative (IA-03)	Zachary Nunn (R)	202-225-5476	100%
U.S. Senator	Chuck Grassley (R)	202-224-3744 · contact form	statewide
U.S. Senator	Joni Ernst (R)	202-224-3254 · contact form	statewide
State Senator (State Senate District 9)	Tom Shipley (R)		100%
State Representative (State House District 18)	Tom Moore (R)		100%

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

Atlantic laws: search for the Atlantic, Iowa code of ordinances
Cass County laws: search for the Cass County, Iowa code of ordinances

State legislative districts

State senate district	Share of residents
State Senate District 9	100%

State house district	Share of residents
State House District 18	100%

ZIP codes

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

50022 (84%)

Get this in your AI agent

Your agent can get Atlantic'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:1903520")

Atlantic 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.