For your county,
Maricopa, there are a few conventional channels listed on the page. If you set up a search for a range of frequencies, you might stumble across a few of these if they are active. But the majority of public safety agencies in your county are on one or more of a number of trunked systems that include your area.
Yes, you could simply search across a range of those frequencies, but your results would be very poor. There are a number of users that your scanner cannot listen to at all. That includes Maricopa County agencies on their
trunked system. That system is P25 Phase II. Your scanner is incapable of monitoring those at all, neither by programming the system, nor by seraching the frequencies in use.
Phoenix & Scottsdale are also on a trunked system.
Regional Wireless Cooperative (RWC) Trunking System, Phoenix, Arizona - Scanner Frequencies
If you tried to simply scan those frequencies, you'd get a hot mess of control channel data, and voice traffic with zero information what you are actually hearing.
With software, you can download and program what you want to hear. See the Easier to Read
manual for your scanner. More help in the Wiki:
Programming Shortcut PSR-500/600 RS Pro-106/197 - The RadioReference Wiki
Software that works with your scanner (and used for importing):
Object Oriented Scanner Software - The RadioReference Wiki
There are also a number of videos that cover programming.
While you still can enter, or search, one or more specific frequencies, that does not work for trunked systems. There is a learning curve, to be sure, but thee is also a lot of help available to access. But of you want a scanner such as one where you enter "a few numbers", such as your location, then you should be looking, instead, at one of the database scanners from Uniden or Whistler, However, as I have cautioned
above, the agencies in your area mostly use trunked systems with simulcast sites. That's a difficult challenge for scanners other than Uniden's SDS100 or SDS200. The Unication pagers and the BlueTail Receiver also handle simulcast, but those are more limited than a true scanner.