Map - Kilcullen

Kilcullen, formally Kilcullen Bridge, is a small town on the River Liffey in County Kildare, Ireland. Its population of 3,473 at the 2011 census made it the 12th largest settlement in County Kildare and the fastest growing in the county, having doubled in population from 1,483 in the census of 2002. By 2016, the population had risen to 3,710. It is situated primarily in the Barony of Kilcullen (in the Civil Parish of Kilcullen), with a part in the Barony of Naas South (Civil Parish of Carnalway), and subsidiary areas include Logstown, Harristown, Carnalway and Brannockstown, Gilltown, Nicholastown, and Castlemartin.

Kilcullen Bridge replaced the original settlement of Kilcullen, now Old Kilcullen, in the centuries following the building of the great bridge at the future site of the town. Other local historical features include Dun Ailinne, New Abbey and Castlemartin, for many years the home of media magnate Tony O'Reilly and his wife, horse-breeding shipping heiress Chryss Goulandris, and now owned by US billionaire John Malone. In the town's hinterland are a number of stud farms.

Kilcullen is situated off the Dublin to Waterford (M9) motorway, between Naas and Kilkenny, and is centred on the crossroads of the R413 and R448 regional roads (the R448 was part of the main road from Dublin to Carlow, Kilkenny and Waterford until the M9 motorway was opened in 1995, bypassing the town).

Kilcullen straddles the River Liffey and is about 50 km from Dublin, under 5 km from Newbridge, and also close to Kildare Town and Naas. There is just one bridge in the town (on the site of the historic bridge which gave rise to the settlement), and none to the north/west for some distance, until Athgarvan, though there are three to the south/east, in Harristown / Brannockstown, one on a public road, one a road bridge hidden on the old Harristown Estate, and one a former railway viaduct, also on private land. First built in the 1310s, the six-arch bridge over the Liffey was last reconstructed c. 1850, and renovated and widened in the early 1970s; the upstream face is modern while if viewed from downstream, the historic style is visible.

Upstream of the town the Liffey is joined by what is called locally the Mill Stream, coming from the direction of New Abbey, and forming the last stage of the substantial Kilcullen Stream (flowing north through Yellow Bog), a nationally monitored waterway. At the western edge of the town is the Pinkeen Stream, a minor tributary of the Liffey, which forms one boundary of Castlemartin Estate. At least two small streams lie further downstream in the Castlemartin area.

The town comprises one main street, with a few connecting roads. The main street slopes from Old Kilcullen and the Athy Road and motorway access, after joining with the Newbridge Road, down to the Liffey, and back up again, more steeply. Schools and churches are concentrated at the southwestern edge, businesses spread along the main street and near the old market square, and the town hall and theatre (former cinema) and heritage centre, and a bank, lie just to the northeast of the bridge.