Country code: +420
White Pages directory - phone numbers and addresses for households, businesses and organizations. In Czech. Type in the name of the person or business you're looking for in co (what) and the location if known (it's not required) in kde (where). Click on hledat to search. Includes maps. Doesn't include subscriber number where they have opted out of listing.
Literally translated - Yellow Pages. Type in what you're looking for and then click najdi (find). Provides useful information including maps, opening times, website links.