Yes, police have jurisdiction in post offices to enforce laws and maintain public safety.
It will depend on the specific jurisdiction. Many state and federal offices, banks, and post offices close early on Christmas Eve.
Post Offices
The plural is Post Offices
No, local police do not have jurisdiction inside a post office for law enforcement purposes. The United States Postal Service has its own law enforcement agency, the United States Postal Inspection Service, which is responsible for investigating crimes that occur within post office facilities.
congress can establish post offices
Post offices are funded by taxes. You pay taxes, the government takes that money and pays for post offices.
Commonly, schools, fire departments, police departments, post offices, and city halls, etc.
Post offices are operated by the federal government.
Pertaining to courts, a court with "exclusive jurisdiction" has power in certain areas or over certain persons (subject matter) to the exclusion of all other courts. Concurrent Jurisdiction: Authority possessed by two or more different courts to hear and decide on the same matter within the same territory. The choice of which court will be used is left up to the plaintiff. Note: Military bases, for example, have their own military police and have exclusive jurisdiction for that particuliar Post/Base, and sometimes to outlying areas surrounding the Base or Post that is in their exclusive jurisdiction. However, certain highways, roads, surrounding the said military Post/Base, can be enforced by local or military police.
post offices
City Police only have jurisdiction within the municipality (Pasadena, TX).
A city police officer's jurisdiction covers only those streets and areas that are inside of the city limits. Typically, a local police officer cannot legally conduct police business outside of his or her jurisdiction.