Connecticut's 1st congressional district (CT-01)
Connecticut's 1st congressional district (CT-01) covers parts or all of Capitol Planning Region, Northwest Hills Planning Region, Lower Connecticut River Valley Planning Region and Naugatuck Valley Planning Region, and 55 ZIP codes (43 wholly inside it). Its 2020 population was 721,189. This is the map in force for the November 3, 2026 election.
Who represents CT-01
| Office | Member | Contact |
|---|---|---|
| U.S. Representative (CT-01) | John B. Larson (D) | 202-225-2265 |
| U.S. Senator | Christopher Murphy (D) | 202-224-4041 · contact form |
| U.S. Senator | Richard Blumenthal (D) | 202-224-2823 · contact form |
Officials serving now (members of Congress until January 3, 2027). Sources: Members of Congress: the @unitedstates project, congress-legislators (CC0).
Counties
| County | Share of the county's residents in CT-01 |
|---|---|
| Capitol Planning Region | 58% |
| Northwest Hills Planning Region | 39% |
| Lower Connecticut River Valley Planning Region | 28% |
| Naugatuck Valley Planning Region | 14% |
ZIP codes
Percentages mark ZIPs only partly in CT-01: the share of that ZIP's residents inside it.
- 06001 (<0.1%)
- 06002
- 06010
- 06016
- 06021
- 06023
- 06026
- 06027
- 06033 (40%)
- 06035
- 06037
- 06040
- 06042
- 06052 (0.1%)
- 06057
- 06060
- 06061
- 06062 (0.5%)
- 06063
- 06065
- 06067
- 06073 (1.7%)
- 06074
- 06088
- 06090
- 06091
- 06095
- 06096
- 06098
- 06103
- 06105
- 06106
- 06107 (99%)
- 06108
- 06109
- 06110
- 06111
- 06112
- 06114
- 06117
- 06118
- 06119
- 06120
- 06414 (5.8%)
- 06416
- 06444
- 06451 (0.2%)
- 06457 (53%)
- 06459 (1.8%)
- 06467
- 06479
- 06480
- 06489
- 06759 (1.3%)
- 06790 (57%)
Towns
Barkhamsted town, Berlin town, Bloomfield town, Bristol town, Colebrook town, Cromwell town, East Granby town, East Hartford town, East Windsor town, Granby town, Hartford town, Hartland town, Manchester town, New Hartford town, Newington town, Portland town, Rocky Hill town, South Windsor town, Southington town, West Hartford town, Wethersfield town, Winchester town, Windsor Locks town, Windsor town, Torrington town, Middletown town, Glastonbury town and Cheshire town.
Get this in your AI agent
Your agent can draw every precinct in CT-01, or list them with population shares (related_geographies). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
get_boundaries(id="us:congressional_district:0901", children_level="precinct", include_districts=True)