For those requiring fingerprinting services, the Crystal Lake Police Department will only fingerprint Crystal Lake residents who reside within the City limits or employees of Crystal Lake businesses located within the City limits. Businesses will only be accommodated for employment purposes. This only affects fingerprinting not required by City Ordinance or otherwise as a necessary part of a City of Crystal Lake licensing requirement. Fingerprinting is by appointment only. Call 815-356-3620 to schedule your appointment. For security reasons, fingerprinting cannot be done when prisoners are in custody.