I know it's an anecdote but in Denver they are only in the very wealthy neighborhoods. Usually here those parts have the city have much lower speed limits than a comparable street in a poorer neighborhood would have so they can generate more revenue from them.
No, they are not at all in the wealthy neighborhoods, they are out in Aurora in the poorer areas and around Buckley AFB to nab the servicemen. I drove past many of them going to work/home and they erroneously flash when a bird flies past or the wind gusts too hard. There seems to have been no correlation at all with the many people I would see running red lights, just random.
I was talking Denver not Aurora or the outlying suburbs. I guess I could of been more clear. Around here they camp outside of Cherry Creek Golf Course and in uptown around 17th. I was also speaking of the speed limit cameras.
The red light cameras here are mainly on large intersections, 6th and Speer etc. Not really poor nor rich more based upon volume of traffic.