Prosperous is a town in north County Kildare, Ireland. It is within the townland of Curryhills, at the junction of the R403 and R408 regional roads, about 40 km (25 mi) from Dublin. Founded in the late 18th century, its 2022 population was 2,413, making it the 15th largest town in County Kildare.

County Kildare is a county in Ireland. It is in the province of Leinster and is part of the Eastern and Midland Region. It is named after the town of Kildare. Kildare County Council is the local authority for the county, which had a population of 246,977 at the 2022 census.