Multiple groups. Some are from Coventry Cove, some are from the "It's a Wonderful Life" group (like the Bijou Theater up next to the ballroom & carousel in the "entertainment district"). Others are just flat out random, like the Menards', Harley-Davidson, and Coke stadium in "New Town". Most of the figurines are people in either 50's era clothing or late 1800s clothing. There's no specific time period...anachronisms abound.
We started with four houses, three town buildings (in the windowsill), and the cathedral, back about 30 years ago. We picked up other pieces in post-Christmas sales and garage sales, and were gifted some of them.