Commonwealth Atlas — Massachusetts Legislature

City or town

County delegation

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Town boundariesCounty boundaries

Middlesex County

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Sources & dates

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Leadership ↗ · Committees ↗

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Senate roster ↗ · House roster ↗

About the data & map

Names, parties, contacts, portraits, and district descriptions come from the Massachusetts General Court. County coverage follows the towns linked to each district, checked against official district descriptions. District descriptions and local portraits are a September 30, 2026 snapshot; roster names, parties, and contacts can refresh independently.

The site automatically requests the official House and Senate rosters, with hourly caching. If the source is unavailable or incomplete, a dated saved roster is shown. Vacant seats have no member card. An address is needed to identify your individual representative and senator.

Town boundaries: MassGIS municipalities. County lines are dissolved town outlines. Roads and geographic context are supplied by OpenStreetMap. Legislative overlays: 2021 House and Senate boundaries, effective from the 2022 elections. Town membership is checked against official member district descriptions; vacancies use spatial overlap. Boundaries are generalized for display and can differ near shorelines. Colors identify selected districts, not parties.