Check with any of the local community centers. Also check with the local school districts. I was planning on taking DS to one this summer. You could always call the school district to find out when they're offered- most schools seem to have them each quarter. The ones around here usually send out a magazine with all the different classes offered.
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Troy Civic Center, 52 dollars for out of city people. Google Troy Civic Center Swimming you should find their site after that. We have really been enjoying the swim class DD and I are in Parent/Infant and DS and DH are in parent/Tot. Like I said we are really enjoying the classes.
Re: Infant Swim class?