Connecticut ranks #17 among US states for total patents filed all time, with 210,340 patents from 34,797 inventors across 311 cities. On a per-capita basis that is 58.3 patents per 1,000 residents, a standard benchmark for comparing state-level R&D intensity.
Top Cities in Connecticut All Time
| Rank | City | Patents | Inventors |
|---|---|---|---|
| #1 | Stamford, CT | 6,982 | 1,447 |
| #2 | Glastonbury, CT | 6,375 | 684 |
| #3 | Town of West Hartford, CT | 5,934 | 885 |
| #4 | Ridgefield, CT | 5,869 | 574 |
| #5 | Danbury, CT | 5,149 | 826 |
| #6 | New Haven, CT | 4,405 | 1,003 |
| #7 | Norwalk, CT | 4,086 | 720 |
| #8 | Fairfield, CT | 3,975 | 661 |
| #9 | Cheshire, CT | 3,802 | 532 |
| #10 | Guilford, CT | 3,723 | 437 |
| #11 | Westport, CT | 3,608 | 523 |
| #12 | Hamden, CT | 3,259 | 554 |
| #13 | Madison, CT | 3,257 | 375 |
| #14 | Trumbull, CT | 3,231 | 533 |
| #15 | Manchester, CT | 3,193 | 606 |
| #16 | Wallingford, CT | 3,106 | 422 |
| #17 | South Windsor, CT | 2,897 | 420 |
| #18 | Middletown, CT | 2,754 | 449 |
| #19 | Milford, CT | 2,683 | 527 |
| #20 | Avon, CT | 2,650 | 385 |
| #21 | Monroe, CT | 2,537 | 413 |
| #22 | Shelton, CT | 2,486 | 439 |
| #23 | Vernon, CT | 2,464 | 419 |
| #24 | Southbury, CT | 2,376 | 306 |
| #25 | Branford, CT | 2,365 | 367 |