In my area of Gloucestershire UK (and the area where my school is, which is another town) it's fairly different. Seems like in the south there's more boring stuff like Rattata and Caterpie. However, we also have plenty of Eevee and an unnatural number of Drowzee. There's a fair amount of diversity too, like when you venture into a more rural area there are a lot of Venonat, whereas in the middle of towns you see the occasional Koffing. It's neat to see the Pokémon actually appearing in their natural habitats reasonably effectively.
It's worth noting that more interesting and stronger Pokémon appear as you progress in levels. The basic Pokémon seem to be similar everywhere, but once you start being able to fight gyms you get more evolutions and stronger Pokémon, and I'm sure that diversity will come into play more and encourage traveling.