for three blocks in the center of town on what is now Illinois Route 59. The merge was between Plainfield/Joliet Road on the south to Lockport Street on the north, but continues to be an area of heavy traffic congestion even outside heavy commuting periods. At one time, the two longest paved highways in the world (Lincoln Highway and U.S. Route 66) crossed within Plainfield. The highways only crossed each other twice and both locations are in Will County. The other location is in neighboring Joliet. Geography Plainfield is located in northwestern Will County at (41.617280, -88.202837). The village limits extend west into the eastern part of Kendall County. Plainfield is bordered to the north by the city of Naperville, to the northeast by the village of Bolingbrook, to the east by the village of Romeoville, and to the south by the city of Joliet. Farmland in Kendall County is to the west. Interstate 55 runs along the eastern edge of the village, with access from two exits. I-55 leads northeast to the center of Chicago and southwest to Bloomington. U.S. Route 30 passes through the center of Plainfield, leading northwest to Montgomery and southeast to Joliet. Illinois Route 126 crosses US-30 in the center of Plainfield, leading northeast to I-55 and west to Yorkville. Illinois Route 59 runs through the center of Plainfield with US-30 but leads north to the west side of Naperville and south to Shorewood. According to the 2010 census, Plainfield has a total area of , of which (or 95.95%) is land and (or 4.05%) is water. The DuPage River flows through the village center, running south towards the Des Plaines River in the Illinois River watershed. Like its namesake, Plainfield's topography is generally flat. Thousands of years ago, land in greater Plainfield used to be part of the bed of proglacial Lake Wauponsee. However, the lake did not hold up long, and eventually drained into the Illinois River valley. The lake left behind a very flat landscape. Much of downtown Plainfield has an elevation of around above sea level, with some areas in the western and northwestern portions of the village's outskirts exceeding . This rise in elevation was created by terminal moraines that were formed during the Wisconsin Episode of the last ice age's last glacial period that has been recorded. Demographics As of the census of 2010, there were 39,581 people, 11,920