Carolina Police Department's motto is 'Honor, Integrity, Service'.
Carolina Academy's motto is 'Whatever it Takes!'.
The motto of Metropolitan Police Service is 'metropolitan1'.
To protect and to serve.Another View: Many (most?) departments have their own motto and the while the above is popular, it is not a universal answer. For example - the motto of the District of Columbia Metropolitan Police is Justitia Omnibus - 'Justice for All'.
The motto of California Highway Patrol is 'Safety, Service, and Security'.
450 police departments
The motto of Seattle Police Department is 'Service, Pride, Dedication'.
The motto of Guelph Police Service is 'Pride, Service, Trust'.
Maharashtra Police's motto is 'सदरक्षणाय खलनिग्रहणाय'.
The motto of Nagpur Police is 'Sadrakshṇāya Khālanīghrahaṇāya'.
The motto of Latur Police is 'सद्रक्षणाय खालनीघ्रहणाय'.
The state motto of Tasmania is "Fertility and Faithfulness".
According to Wikipedia, there are 131 city police departments in Oregon.