The 15,000ft paved runway at KEDW has a 9,000ft unpaved overrun extending onto the Groom Lake dry lake bed. There are several runway outlines on the lakebed, of which the longest is 17/35, at about 7.5 miles (that's getting on for 40,000 ft)
I think Galway (EICM) has just had an ILS installed. Runway is 4430ft with a landing distance of 3937ft. Shortest ILS runway in this corner of the world?
A few miles further southwest, the runway on Inishmaan (EIMN) is just 1181ft but has daily flights by Aer Arann Islands. I think the runway at St. Mary's on the Isles of Scilly is even shorter though.