Derby is an unincorporated community

Unincorporated area

In law, an unincorporated area is a region of land that is not a part of any municipality.To "incorporate" in this context means to form a municipal corporation, a city, town, or village with its own government. An unincorporated community is usually not subject to or taxed by a municipal government...

 along the Ohio River

Ohio River

The Ohio River is the largest tributary, by volume, of the Mississippi River. At the confluence, the Ohio is even bigger than the Mississippi and, thus, is hydrologically the main stream of the whole river system, including the Allegheny River further upstream...

 in far southern Union Township

Union Township, Perry County, Indiana

Union Township is one of seven townships in Perry County, Indiana, USA. As of the 2000 census, its population was 523.-Geography:According to the United States Census Bureau, Union Township covers an area of ; of this, is land and is water.-Unincorporated towns:* Derby at * Dexter at * Magnet...

, Perry County

Perry County, Indiana

Perry County is a county located in the southwestern part of the U.S. state of Indiana. As of 2010, the population was 19,338. The county seat is Tell City. It is the hilliest county as well as one of the most forested counties of in Indiana as it features more than of Hoosier National Forest...

, Indiana

Indiana

Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...

, United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. It lies at the intersection of State Roads 66

Indiana State Road 66

State Road 66 is an east–west highway in six counties in the southernmost portion of the U.S. state of Indiana.-Route description:State Road 66 begins at the eastern end of a toll bridge over the Wabash River in New Harmony and ends at U.S. Route 150 east of Hardinsburg...

 and 70

Indiana State Road 70

State Road 70 in the U.S. state of Indiana consists of two discontinuous east–west segments of two-lane rural roadway. State Road 70 passes through no cities or towns of significant size.-Western segment:...

 above the city of Tell City

Tell City, Indiana

Tell City is a city in Troy Township, Perry County, Indiana, along the Ohio River, Indiana's southern border. The population was 7,272 at the 2010 census. The city is the county seat of Perry County.-History:...

, the county seat

County seat

A county seat is an administrative center, or seat of government, for a county or civil parish. The term is primarily used in the United States....

 of Perry County. Its elevation is 449 feet (137 m), and it is located at 38°1′49"N 86°31′38"W (38.0303400, -86.5272018). Although Derby is unincorporated, it has a post office

Post office

A post office is a facility forming part of a postal system for the posting, receipt, sorting, handling, transmission or delivery of mail.Post offices offer mail-related services such as post office boxes, postage and packaging supplies...

, with the ZIP code

ZIP Code

ZIP codes are a system of postal codes used by the United States Postal Service since 1963. The term ZIP, an acronym for Zone Improvement Plan, is properly written in capital letters and was chosen to suggest that the mail travels more efficiently, and therefore more quickly, when senders use the...

of 47525.