I have too have worked in different in different counties and have been paid more in some counties than in others. When filling out my paperwork in one county I was pleasantly surprised when HR said,"Oh, we can do better than that," when we were discussing salary. I also found different counties have different local supplements depending on your certifications and whet you are teaching. One county even paid math teachers at "at risk" schools, with a degree in math a 10,000$ bonus if their EOG scores increased by a certain percent. Those that taught math but did not have a BS in math received a different amount. Not saying it's right, but I experienced this first hand.
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