Find an HDTV channel listing for your carrier at TV.com or TVListings.AOL.com. These websites list HD and non-HD programs on various cable, broadcast and satellite networks throughout the United States.
At TV.com, click the Listings tab near the top of the main page, and then click the Edit button near the top-right of the page to set your carrier. Click the HD Only tab near the top of the listing to display HD programs in white boxes on the grid; other channels display in gray boxes. Click a program listing on the grid to display a description of the program. Hover the cursor over the tab to the left of the HD Only button near the top of the listing, and then click a program type or genre, such as Comedies, Movies or Sci-Fi, to display only those programs in white boxes. Sign up for a free account, log in, and click options on the drop-down menu beneath the Favorites tab to set this website to highlight your favorite channels and shows.
At TVListings.AOL.com, click the Change Location/Provider link near the top-left of the main page, type your ZIP code in the box near the top of the page, and then click the Lookup button. Click your carrier on the list of providers to display a program listing. High definition programs include a purple symbol labeled "HD." Make selections on the Jump To and At drop-down menus near the top of the listing to change the programming day or times displayed.