Pacific was platted in 1852 when the railroad was extended to that point. It was so named because here the new railroad started for the Pacific Ocean. A post office called Pacific has been in operation since 1854.
Pacific is located at  The city straddles the Franklin/St. Louis county line, which lies halfway on the blocks between Elm and Neosho streets. St. Louis is 30 miles (50 km) northeast of Pacific, and the communities comprising the Missouri Rhineland are 20 miles (30 km) northwest of the city.(38.481503, -90.750015).
Pacific is bordered on the southeast by the Pacific Palisades Conservation Area. Access to the Meramec River, through the Pacific Palisades Conservation Area, is located east of the city, adjacent to Eureka on the north side. The majority of the Pacific Palisades Conservation Area is south of the river and can be accessed 1 mile (1.6 km) south of the city in Jefferson County.
According to the United States Census Bureau, the city has a total area of 5.93 square miles (15.36 km2), of which 5.92 square miles (15.33 km2) is land and 0.01 square miles (0.03 km2) is water. A total of 1.7 sq mi (4.4 km2) of the city is located in St. Louis County. The city is located directly west from Eureka and 5 miles (8 km) east of Gray Summit.
The Old Downtown Commerce Area is mostly located along First and St. Louis streets. The historic downtown buildings, built in the late 1800s, have been fully or partially restored, and new businesses have moved into the buildings.
The Red Cedar Inn, on the east end of town, was a meeting place for people around the country seeking out one of the oldest restaurants still standing on Route 66. The restaurant closed in 2007.
Elementary and secondary schools in the Meramec Valley School District:
- Coleman Elementary School
- Nike Elementary School
- Robertsville Elementary School
- Truman Elementary School
- Zitzman Elementary School
- Meramec Valley Early Childhood Center
- Meramec Valley Community School- formerly Pacific Middle School
- Pacific Intermediate- formerly Meramec Valley Middle School (5th & 6th grades)- formerly Pacific Junior High School
- Riverbend Middle School (7th & 8th grades)
- Pacific High School
|City of Pacific|
Downtown Pacific in August 2013
Location of Pacific, Missouri
|Country||United States of America|
|Counties||Franklin, St. Louis|
|• Mayor||Steve Myers|
|• Total||5.93 sq mi (15.36 km2)|
|• Land||5.92 sq mi (15.33 km2)|
|• Water||0.01 sq mi (0.03 km2)|
||466 ft (142 m)|
| • Estimate
|• Density||1,200/sq mi (460/km2)|
|Time zone||UTC-6 (Central (CST))|
|• Summer (DST)||UTC-5 (CDT)|
|GNIS feature ID||0731630|