Here in the US, broadcast TV is siloed into different geographical markets. Leave your designated spot, and you'll find that there are different channels, unfamiliar schedules and news anchors you've never seen before in your life. Who is that guy, and who let him on the air in Milwaukee?

Redditor u/Owldog17 looked at the 210 designated market areas in the US that segment the TV-watching public, and put together a map to show where each of the top ten markets are, and just how big they can get.

Unsurprisingly, the northeast corridor dominates the top of the list with four markets: New York (#1), Philly (#4), Boston (#8) and DC (#9). California has two spots: Los Angeles (#2) and San Francisco (#10). Texas has two more: Dallas (#5) and Houston (#6). As for the oddballs, we round out the list with Chicago (#3) and Atlanta (#7).

Click images to enlarge

While the map above is great for indicating the population, it can be a bit difficult to see the outlines of each market. Below, you'll see a color-coded map from Wikipedia that gives a good idea of where each market starts and stops.

^{Image: SharpShark3}

Via Reddit.

[Image: RDNE Stock project]