Lanark is a small unincorporated village located in Upper Saucon Township

Upper Saucon Township, Pennsylvania

Upper Saucon Township is a township in Lehigh County, Pennsylvania, in the United States. It is a suburb of Allentown, Pennsylvania, in the Lehigh Valley region of the state, and geographically in the Saucon Valley....

, Lehigh County

Lehigh County, Pennsylvania

-Climate:Most of the county's climate is considered to fall in the humid continental climate zone. Summers are typically hot and muggy, fall and spring are generally mild, and winter is cold. Precipitation is almost uniformly distributed throughout the year....

, Pennsylvania

Pennsylvania

The Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...

. Residents of Lanark are served by the Center Valley

Center Valley, Pennsylvania

Center Valley is an unincorporated village one mile north of Coopersburg, Pennsylvania, at the intersection of Pennsylvania Route 309 and Pennsylvania Route 378 in Upper Saucon Township, Lehigh County, Pennsylvania, in the United States....

 and Coopersburg

Coopersburg, Pennsylvania

Coopersburg is a borough in Lehigh County, Pennsylvania, United States. It is a suburb of Allentown in the Lehigh Valley region of the state.The population of Coopersburg was 2,386 at the 2010 census.-Geography:...

 Post Offices with 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 18034 and 18036, respectively. Lanark is located within Southern Lehigh School District

Southern Lehigh School District

Southern Lehigh School District is a public school district located in Lehigh County, Pennsylvania, in the United States. It serves the borough of Coopersburg and Lower Milford and Upper Saucon Townships. The district has three elementary schools with students from k-3. The Intermediate School,...

. Students in grades nine through twelve attend Southern Lehigh High School

Southern Lehigh High School

Southern Lehigh High School is a four-year public high school located in Center Valley, Pennsylvania, in the United States. It is the only high school in the Southern Lehigh School District....

.

Located at the southeastern end of a pass over South Mountain

South Mountain (eastern Pennsylvania)

South Mountain is a colloquial name applied to features in the mountain range extending south and south west from the Lehigh Valley to the Lebanon Valley regions of Pennsylvania. At times, it also been known as Durham Hills, Reading Hills, and the Lehigh Mountains...

, Lanark is a significant crossroads. Limeport Pike heads south, Vera Cruz Road heads southwest, Saucon Valley Road heads east, and Lanark Road heads southeast. Interstate 78

Interstate 78 in Pennsylvania

Interstate 78 is an east–west route stretching from Union Township, Lebanon County, Pennsylvania to New York City. In the U.S. state of Pennsylvania, I-78 runs for about 77 miles in Pennsylvania, from the western terminus at Interstate 81 to New Jersey state line; I-78 continues into New...

 approaches from the northeast, Pennsylvania Route 309

Pennsylvania Route 309

Pennsylvania Route 309 is a major highway which runs for 134 miles through Pennsylvania in the United States. It connects Philadelphia and its northern suburbs to Allentown, Hazleton, and Wilkes-Barre. A limited-access highway portion of PA 309 in the Wilkes-Barre area is known as the North...

 from the southeast, and meet together with Pennsylvania Route 145

Pennsylvania Route 145

Pennsylvania Route 145 , unofficially known as "the gateway to Allentown", is a long north–south state highway in the Lehigh Valley area of eastern Pennsylvania...

in Lanark at a major interchange, all heading northwest over the mountain. This is the southern and eastern end of the I-78/PA 309 concurrency.