Is it OK to lie about being married to get a lower auto insurance rate?

No. They will catch you sooner or later.

First of all in the state of Missouri they check to see who even lives in the residence and I have had to pay higher premiums because of roommates that did not even drive my car. Who is this agent? yes I disagree that married people are safer drivers as are women. How often do you see a woman driving a SUV while talking on the phone, putting on makeup with a busload full of children is that safer??? Also I have known of several couples getting into arguments and one storms out and is mad and then ends up in an acident and even getting killed. Even thought this os not legal I dont think what they the insurance providers are doing are so legal either. We all need to ban together against them!

Well if you get into an accident they usually do everything they can to not have to pay up, so they will find out you aren't married and probably won't cover your accident costs

They wont really investigate it until they need to. Which means that you would have to get into an accident and that is when you get into trouble... So yes, it will come back to bite you very very very hard!

It is sufficient cause to avoid paying any claim you might have under the policy.

First it would invalidate your insurance, Second it is called fraud.

yes

That would be insurance fraud and it is very illegal.

Sure it is, if you'd like to be in jail for fraud. :)

Try https://tr.im/bYrJS