Voter Registration Updates for Key Florida Counties – September 16th, 2025
Bottom Line: In a matter of four years Florida went from being viewed as the ultimate swing state to a red state. The state’s latest voter registration information reflected the continued surge in Republican momentum in Florida that has extended beyond November’s election. The Republican advantage over Democrats stood at a record of over 1.35 million voters entering September.
The record performance for Republicans over the prior two election cycles wouldn’t have been possible if not for the rightward turn of three of the four largest counties - Hillsborough, Miami-Dade and Palm Beach. Last November’s election featured President Trump winning traditional blue counties Duval, Hillsborough, Miami-Dade and Osceola – while only losing Palm Beach County by less than one point.
At the peak of the Democrat voter registration advantage in Palm Beach County, Democrats held an advantage of 138,400 voters. Democrats now hold an advantage of 18,289 voters a total that’s 11,879 fewer voters than the previous update, marking the biggest one month change in voters I’ve seen in a non-election year. Here's a look at other key counties with net partisan changes over the prior month:
- Duval: Democrats currently lead Republicans by 8,281 (GOP +1,475 voters)
- Hillsborough: Republicans flipped the county to a GOP majority earlier this year with a lead of 17,528 (GOP +320 voters)
- Indian River: Republicans currently hold an advantage of 35,124 (GOP +122 voters)
- Martin: Republicans now hold an advantage of 37,894 37,813 (GOP +81 voters)
- Miami Dade: Republicans flipped the county to a GOP in May with the Republican advantage now standing at 36,554 (GOP +956 voters)
- Osceola: Democrats currently lead Republicans by 12,389 (GOP +263 voters)
The biggest storyline in Florida’s political scene continues to be the state’s blue counties becoming far less blue. Palm Beach County represents one of the most significant shifts in the state. In this off-election year, changes in voter registrations will be the most visible signs of political trends within the state.