In most areas, home sales are a matter of public record – you can get all the information you want about recent sales, including prices and listing times, by calling the county Recorder of Deeds.
An easier way is to ask your real estate professional. If you’re interested in a particular home, a sales professional may be able to provide you with a list of comparables – sale prices of homes in your area that are roughly the same size and age as the home you’re considering. Although there will certainly be some differences between the homes – the house next door may have an extra bedroom, or the one down the block may be older than the one you’re looking at – it’s a good basis for evaluating the seller’s asking price.