Recent Chester County voter registration data last updated on April 29th reflects a continual positive trend for Democrats. As of April 29th, there were 148,600 registered Republicans, 138,230 registered Democrats, and 61,266 voters registered as Independent or Non-Affiliated. Republicans account for 42.6% of the voters versus 39.7% for Democrats and 17.6% for Independents or Non-Affiliated.
It’s interesting to note that younger voters ages 18-44 have registered as Democrats in much greater numbers than Republican younger voters. The Republicans continue to lead in registrations for ages over 45.
CHESTER COUNTY REGISTRATION DATA AS OF APRIL 29, 2019
| Age & Party | 18-44 | 45-64 | 65+ | TOTALS | % By Party |
| Democrats | 61,737 | 46,981 | 29,512 | 138,230 | 39.7% |
| Republicans | 45,861 | 61,921 | 40,818 | 148,600 | 42.7% |
| Non-Affiliated | 31,530 | 21,117 | 8,619 | 61,266 | 17.6% |
| TOTALS | 139,128 | 130,019 | 78,949 | 348,096 | |
| % By Age | 40.0% | 37.4% | 22.7% |
Below is a table comparing recent registration data with May 2015. It shows that the number of registered Democrats has increased by 14% compared to a 4% increase for Republicans and a 6% increase for Non-affiliated Voters in Chester County.
| May 2015 | May 2019 | Increase | |
| Democrats | 120,998 | 138,230 | +14.2% |
| Republicans | 143264 | 148,600 | +3.7% |
| Non-Affiliated | 57,798 | 61,266 | +6.0% |
| TOTALS | 322,060 | 348,096 | +8.1% |
