| Capital: | Middletown |
|---|---|
| Origen y Formación del condado: | From parts of Hartford County and New London County |
| Población: | 165,676 habitantes |
| Área: | 369 sq mi |
| Localización del condado dentro de Connecticut: |
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Localidades en Middlesex, Connecticut
- Chester
- Clinton
- Cromwell
- Deep River
- Durham
- East Haddam
- East Hampton
- Essex
- Essex Village
- Fenwick
- Haddam
- Higganum
- Killingworth
- Lake Pocotopaug
- Middlefield
- Middletown
- Moodus
- Old Saybrook
- Old Saybrook Center
- Portland
- Saybrook Manor
- Westbrook