Hi Belinda - I live in McKinney...it's a great city to live in. McKinney would not have been ranked the second best place to live in the nation this year, nor the fifth best place to live last year if the crime was that high. You can go to city-data to see more information, as well as other sites.
McKinney has over 133,400 residents, the schools are great...several reaching exemplary status and the city is unlike any other in the metroplex.
I hope this helps to answer your question, feel free to ask any others.