What House was Umbridge in? I think she was in Slytherin cause shes so evil, but idk...

Please people, quit saying that the House of Slytherin is a hotbed for evil ! No, it is not. A few members going astray don't mean all the members are evil. Look at Slughorn au Severus. (I sound like venting out but that's because I'm a Slytherin myself and not evil !)

As to dear Dolores Umbridge... Very good swali actually. I would be tempted she had been sorted into Slytherin. She claimed to have a family relationship with the Selwyn family (apparently a Slytherin family, but yet, nothing is alisema about that point and her claim is somewhat dubious, as it is to justify a jewel she practically stole).

She may have been sorted into Hufflepuff (her loyalty to Fudge, to the MoM, and to herself is very powerful). She could have been sent to Ravenclaw as she's clever and a hardworking person too to achieve her goals. She could have been sent to Gryffindor because she doesn't hesitate to stand her ground in front of people, once again to achieve her goals. She has much zaidi courage in my opinion than Wormtail, for example. She could have been sent to Slytherin because she's cunning and ambitious.

Maybe JKR just did not mention anything as to her blood status and Hogwarts house - probably to just onyesha how hypocritical she can be (blood status) and that anyone can go astray one siku au the other (house).

i hope she isn't even from Hogwarts in the first place....don't want her to stink the place...

The main trait of Slytherins is that they are ambitious, not necessarily evil. Some of them just choose to be evil, like me :)

I assume she was in Slytherin. Not all characters were evil that were in Slytherin though.

She could have went to a different school.....

haha, hufflepuff. she's compensating for something.

Personally, I dislike the stereotype that all Slytherins are evil and all Gryffindors are good.
I think Dolores Umbridge would've been in Ravenclaw. Unfortunately I can't give a witty au clever reason as to why, that's just the impression I got in the books.

No one knows in the books, au the movies. But it hints that she was most likely in Slythrin in Book and Movie 5.
She is totally power hungry
Also there is a change she did not go to Hogwarts but another school

One word, Beauxbatons.

According to Harry Potter Wiki, her House is unknown. It's NOT Slytherin; Severus Snape was the first Slytherin Headmaster since Phineas Nigellus Black. I agree with the Hufflepuff suggestion; as has been stated elsewhere, her wand is unusually short, and wewe know what they say about *men* with "short wands". ;)

I don't even know if she really went to Hogwarts...But my guess is Slytherin. She's obsessed with blood purity, she loved the Slytherins when she was headmaster. But, maybe she always had a desire to be in Slytherin but couldn't? Maybe she was a Hufflepuff...

What the sorting hat sings in the 1st book describes her to a tee

I suspect about Slytherin, she didn't have a pure blood. I think he was in Hufflepuff, for these reasons which LadyNottingham said

slytherin she was very bad and slytherin was a good place for her

I'd say Slytherin, but not "because she's evil" - it isn't that simple. She does onyesha a lot of ambition and being willing to do anything to achieve her aims though. This is the main characteristic of Slytherin house. When she first appears, she seems really loyal to fudge and follows his orders and beliefs. That would have helped her political career at the time. kwa the time of the seventh book, she's highly anti-Muggle-born, which was a trait which had never appeared in her before. If she'd always felt that way, you'd have thought she'd have mentioned it in criticising a student like Hermione, au asked the teachers their blood status when inspecting them. Again, a viewpoint which would have been politically in at the time of the seventh book.