Rio de Mouro, Portugal

With a population of 47,311, Rio de Mouro is no sleepy suburb. The town's sprawling 16.49 sq km footprint is a testament to its ambitions, though bureaucracy is a persistent headache for residents. At 15 km from Lisbon, the commute is manageable, but the distance means you'll have to brace for the capital's high costs of living. Overall, Rio de Mouro offers a more affordable alternative to the city, though the trade-offs may not suit everyone.