You'll find this information on Trulia at the link below in our Stats & Trends section. The stats are broken down by property crime and violent crime and you can compare the city average to the county and state averages as well.
To find this information for other areas, click on the Stats & Trends tap at the top of the page and enter your desired location into the search box. Our Stats & Trends pages have a lot of information on market trends and area schools, and you'll find the crime data in the Community Info section.
The best source for this information is the local police department or county sheriff's department. they have access to the most current and accurate information and are normally very willing to be helpful.
Be aware that 76104 includes a combination of homes in a revitalized area, and some in a more run-down part of town that is suffering from urban decay. Thus, an overall average might not be fully representative of a specific area you are looking at.