Llangollen has all the facilities you would expect from a small town - and more. Main parking is in Market Street, and there is some in Hall Street and Parade Street, where you can also find the Police Station. Parade Street also houses the Museum, European Centre for Training & Regional Co-operation, and the main bus stop. The public toilets are in Market Street.

The doctors' surgery and health centre is in Regent Street (A5) and the pharmacy is across the road from the surgery. There is a dentist in Chapel Street, an optician in Oak Street and a vet in Berwyn Street (A5).

NatWest Bank and Barclays are in Castle Street. The Post Office is inside Stans Superstore & petrol station on Berwyn Street (A5). There are several churches and chapels in the town. St Collen's church, with an entrance on Church Street and on the A5 by the Hand Hotel, is the parish church.