Devon is broad, rural and awkwardly shaped. That matters when you are dating. A national app may count two people as nearby because they fall within the same generous radius, but mileage is only the first part of the calculation. Roads, seasonal traffic, public transport and the route around or across Dartmoor can turn a promising match into a serious journey.
Think in terms of places you can reach without resenting the trip. From Braunton, it may be perfectly realistic to meet someone in Barnstaple, Ilfracombe or Bideford. From Kingsbridge, a date in Dartmouth or Totnes might fit into an ordinary weekend, while north Devon probably will not. Around Honiton, your practical area may include Ottery St Mary, Sidmouth, Axminster and nearby villages, depending on transport. Tavistock has its own pattern again, with Dartmoor and the Cornwall boundary shaping journeys more than county labels do.
There is no correct number of miles. A person who drives and works from home may happily travel farther than someone relying on an evening bus. Parents with fixed childcare may need a much tighter area. People dating after retirement can have more flexibility, although that does not mean they want to spend every other day crossing the county.
The useful question is not “Could I get there?” It is “Would I still make this journey regularly in three months?”
Start your search with the towns that already belong to your normal life. Widen it gradually if the routes remain workable. A smaller selection of Devon singles within easy reach is usually worth more than a long list of people you are unlikely to meet twice.