I didn't my second 15k today. First one was last September and I finished in 1:23.4. Today I finished in 1:12 flat. It was a nice flat out and back course. My goal was an 8 min mile and I beat it so I'm very satisfied.
There aren't that many 10k or 15k's around here either. I don't really know why, it's a good distance. I guess the majority of the casual runners don't like doing more than 3 miles though.