Connecticut ranks #20 among US states for total patents filed in 2025, with 5,224 patents from 2,605 inventors across 202 cities. On a per-capita basis that is 1.4 patents per 1,000 residents, a standard benchmark for comparing state-level R&D intensity.
Top Cities in Connecticut 2025
| Rank | City | Patents | Inventors |
|---|---|---|---|
| #1 | Glastonbury, CT | 265 | 97 |
| #2 | Stamford, CT | 245 | 136 |
| #3 | Town of West Hartford, CT | 242 | 117 |
| #4 | New Haven, CT | 209 | 124 |
| #5 | Guilford, CT | 128 | 52 |
| #6 | Farmington, CT | 96 | 43 |
| #7 | Westport, CT | 95 | 43 |
| #8 | Fairfield, CT | 94 | 42 |
| #9 | Madison, CT | 92 | 44 |
| #10 | Cheshire, CT | 90 | 34 |
| #11 | Windsor, CT | 84 | 28 |
| #12 | Manchester, CT | 84 | 45 |
| #13 | Danbury, CT | 82 | 49 |
| #14 | Vernon, CT | 80 | 35 |
| #15 | South Windsor, CT | 78 | 40 |
| #16 | Avon, CT | 78 | 42 |
| #17 | Hamden, CT | 76 | 45 |
| #18 | Middletown, CT | 75 | 34 |
| #19 | Norwalk, CT | 74 | 31 |
| #20 | Trumbull, CT | 66 | 30 |
| #21 | Milford, CT | 63 | 28 |
| #22 | Greenwich, CT | 62 | 33 |
| #23 | Branford, CT | 60 | 31 |
| #24 | Southington, CT | 60 | 25 |
| #25 | Wethersfield, CT | 57 | 22 |