If you are just interested in Prescott, you can go to the county website...not going to tell you much as for elevation or you can download http://earth.google.com or Google map even Trulia. Great resource just type in the address and get the location on the map. Just remember the general rule of thumb in Prescott is that South is higher elevation than the north or the north east. Temperature will be a bit hotter as you get into the valleys and coolers in the high grown. Now after you down load and type in 86301 zip code you can move the mouse around and look at the bottom of the page and you will get the elevation.
If you have troubles, email me the property I will email you elevation, no hassles.
On the right side of the screen, click land features, check one of the boxes for contours. The go to the search screen above and do a parcel number search....you should get a map showing the topography and elevation.