Clay County Florida map | Green Cove Springs and Black Creek

The Clay County Florida map is more useful when the county is divided into distinct geographic zones rather than treated as one Jacksonville suburb. Green Cove Springs is the county seat on the west bank of the St. Johns River. Orange Park, Fleming Island, and the Oakleaf area belong to the faster-growing northern suburban corridor; Middleburg sits in the Black Creek drainage; and Keystone Heights plus Camp Blanding form a southwestern landscape of lakes, sandhills, pine forest, and military land. U.S. 17, SR 21, SR 16, and SR 23 connect those zones in very different directions.

Quick Facts

The U.S. Census Bureau estimates 239,593 residents as of July 1, 2025, a 9.8 percent increase from the 2020 estimates base. The 2020 Census counted 218,245 residents, and the county has 604.61 square miles of land. The growth pattern is geographically uneven: northern communities tied to the Jacksonville metro have expanded far more continuously than the military, forest, lake, and rural landscapes around Camp Blanding and Keystone Heights.

What the Map Shows

Green Cove Springs is the legal and governmental anchor on the St. Johns River. The courthouse and county administration are located there, while U.S. 17 runs north toward Fleming Island and Orange Park and south toward Putnam County. SR 16 extends west from Green Cove Springs toward Penney Farms, Camp Blanding, and the Starke direction. That combination makes the county seat a junction between the river corridor and the interior, even though it is not the county’s largest suburban concentration.

The northern and central communities require a different reading. Orange Park is incorporated, but Fleming Island, Middleburg, and Oakleaf are large unincorporated communities. Fleming Island lies among the St. Johns River, Doctors Lake, and Black Creek waters, while Middleburg developed along Black Creek around the SR 21/CR 218 corridor. Municipal boundaries therefore tell only part of the story; some of the county’s most prominent population centers do not have separate city governments.

County Layout and Location

Clay County occupies the southwest side of the Jacksonville region in Northeast Florida. Duval County is to the north, St. Johns County to the east across much of the St. Johns River corridor, Putnam County to the south, and Bradford County to the west. The landscape changes sharply from riverfront and suburban development in the northeast to Black Creek wetlands, Kingsley Lake, Trail Ridge sandhills, and lower-density forest farther southwest.

The road system mirrors those regional differences. U.S. 17 links Orange Park, Fleming Island, and Green Cove Springs along the eastern side. SR 21/Blanding Boulevard runs southwest through Middleburg toward Keystone Heights. SR 16 connects Green Cove Springs with the western county, while SR 100 crosses the Keystone Heights area toward Bradford and Putnam Counties. SR 23/First Coast Expressway adds a limited-access route through the northwest growth corridor; Florida’s Turnpike reports the Blanding Boulevard-to-I-10 segment as open and additional segments toward the St. Johns River and I-95 under construction.

Local Context

Black Creek is one of the county’s most important internal water systems. Its North and South Forks drain the central interior and converge toward the St. Johns River. Clay County flood guidance separately identifies the St. Johns River, North and South Forks of Black Creek, Little Black Creek, Doctors Inlet, and several lakes as significant low-lying flood areas. A county boat ramp at Middleburg provides Black Creek access all the way to the St. Johns, showing that the creek is both a drainage system and a practical eastward water corridor.

Camp Blanding explains much of the broad undeveloped area in western Clay County. The Florida Fish and Wildlife Conservation Commission states that the Camp Blanding Wildlife Management Area alone covers more than 56,000 acres east of Starke and is managed in cooperation with the Florida Department of Military Affairs. Mature pine stands occupy much of the north, bottomland hardwoods line Black Creek headwaters, and extensive sandhills occur in the south. Military operations can also restrict access, so the sparse road pattern reflects an active training and conservation landscape rather than unused land.

The Keystone Heights side has a distinctive upland geology. Mike Roess Gold Head Branch State Park lies in Clay County on rolling sandhills; Florida State Parks places its northern portion in the higher Trail Ridge Province and its southern portion in the more sinkhole-prone Hawthorne Lakes Province. Groundwater seepage has carved steephead ravines, while limestone dissolution contributes to sinkhole lakes. This terrain explains why the southwestern map contains clusters of lakes and more noticeable relief than the low St. Johns River floodplain.

Orange Park, Fleming Island, and Oakleaf form the county’s strongest connection to metropolitan Jacksonville. Recent population growth has increased housing and commuting pressure along SR 21, U.S. 17, and SR 23, while the southern and western county remains much less continuously urbanized. That contrast is one of the most important patterns to retain when comparing Clay County with neighboring Duval or St. Johns County.

Ways to Use This Map

Begin with the St. Johns River and U.S. 17 to place Orange Park, Fleming Island, and Green Cove Springs along the eastern side. Then follow SR 21 southwest through Middleburg toward Keystone Heights. Add Black Creek, Camp Blanding, Kingsley Lake, and SR 23 last. That order separates metropolitan growth, river settlement, creek drainage, military land, and upland lake country without reducing the county to a single Jacksonville-oriented corridor.

• Eastern river corridor: compare Orange Park, Fleming Island, and Green Cove Springs along U.S. 17 and the St. Johns River.
• Black Creek geography: relate Middleburg and the North/South Fork system to the St. Johns River outlet.
• Southwestern landscape: separate Keystone Heights lake-and-sandhill country from the large Camp Blanding military/forest tract.
• Growth corridors: compare SR 21 and SR 23 with the older U.S. 17 river route toward Jacksonville.

Frequently Asked Questions

What is the county seat?

Green Cove Springs is the county seat. The Clay County courthouse and county government offices are located there on the St. Johns River side of the county. Orange Park may appear more closely tied to the larger Jacksonville urban area, but it is not the county seat.

Are Orange Park and Fleming Island both incorporated?

No. Orange Park is an incorporated town, while Fleming Island is unincorporated. Clay County identifies four municipalities: Green Cove Springs, Orange Park, Keystone Heights, and Penney Farms.

Where is Camp Blanding?

Camp Blanding occupies a large tract in western and southwestern Clay County near Keystone Heights and Kingsley Lake. Its Wildlife Management Area exceeds 56,000 acres, and military activity means some areas may be restricted or closed at various times.

Sources

• Clay County, Florida — Welcome to Clay County — county identity, municipalities, and Camp Blanding
• U.S. Census Bureau QuickFacts — Clay County, Florida — 2025 population estimate and 2020 population, land area, and density
• Clay County Flood and FEMA Information — St. Johns River, Black Creek, and lake floodplain geography
• Florida Fish and Wildlife Conservation Commission — Camp Blanding WMA — western military/forest land and Black Creek headwaters
• Florida State Parks — Gold Head Branch Geology — Keystone Heights sandhills, steepheads, and sinkholes
• Florida’s Turnpike — First Coast Expressway — SR 23 existing and future segments

Related County Maps

• Duval County Florida map
• St. Johns County Florida map
• Putnam County Florida map
• Bradford County Florida map
• Baker County Florida map