After graduation, the starting salary for a constable is $51,156 per annum. In addition, there are shift penalties and overtime payments available.
Annual increments are payable. Currently a constable can expect to be earning $56,943 per annum by their fourth year of service.
American Police Officers
It depends on the city and state you live in. Each city has a set wage for their police officers pay, and what they get paid by order of seniority. You should visit the website of that particularly city's police force. Normally in their FAQ, they tell you what the average officer makes, or look in the job description and it should tell you.