A local post is a mail

Mail

Mail, or post, is a system for transporting letters and other tangible objects: written documents, typically enclosed in envelopes, and also small packages are delivered to destinations around the world. Anything sent through the postal system is called mail or post.In principle, a postal service...

 service that operates only within a limited geographical area, typically a city

City

A city is a relatively large and permanent settlement. Although there is no agreement on how a city is distinguished from a town within general English language meanings, many cities have a particular administrative, legal, or historical status based on local law.For example, in the U.S...

 or a single transportation route. Historically, some local posts have been operated by governments, while others, known as private local posts have been for-profit companies. Today, many stamp collectors operate hobbyists' local posts, issuing their own postal "stamps" for other collectors but rarely carrying any mail.
Government local posts go back to at least 1680, when the Penny Post

Penny Post

The Penny Post is any one of several postal systems in which normal letters could be sent for one penny.-London Penny Post:In England, the Post Office had a monopoly on the collection and carriage of letters between post towns but there was no delivery system until the London Penny Post was...

 was established in London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

 to handle intra-city mail delivery at a uniform rate of one penny.

From 1840 onwards, when postage stamp

Postage stamp

A postage stamp is a small piece of paper that is purchased and displayed on an item of mail as evidence of payment of postage. Typically, stamps are made from special paper, with a national designation and denomination on the face, and a gum adhesive on the reverse side...

s were first introduced, special stamps were often issued; for instance the canton

Cantons of Switzerland

The 26 cantons of Switzerland are the member states of the federal state of Switzerland. Each canton was a fully sovereign state with its own borders, army and currency from the Treaty of Westphalia until the establishment of the Swiss federal state in 1848...

s of Switzerland

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

 issued stamps for use within a canton, and inscribed them "Poste-Local" or "Orts-Post".