Hog Island (San Joaquin County)

Acker Island (also known as Lost Isle) is a small island in the Sacramento–San Joaquin River Delta. It is part of San Joaquin County, California. Its coordinates are 37°59′51″N 121°26′56″W, and the United States Geological Survey measured its elevation as 3 ft (0.91 m) in 1981. It appears on a 1952 USGS map of the area.

Spud Island is a small island of the San Joaquin River, located in the Sacramento–San Joaquin River Delta in northern California. It was once used to farm onions; while it is no longer used for agriculture, it remains inhabited. In the late 20th century it was the site of a county park, which offered camping, fishing and swimming amenities free of charge.

The Rindge Tract is an island in the Sacramento–San Joaquin River Delta. It is part of San Joaquin County, California, and managed by Reclamation District 2037. Its coordinates are 38°01′20″N 121°26′05″W, and the United States Geological Survey measured its elevation as −3 ft (−0.91 m) in 1981. It appears on a 1952 USGS map of the area.

Tule Island is a small island in the Sacramento–San Joaquin River Delta, which exists as part of a complex of islands including directly-adjacent Fern Island and Headreach Island. It is a naturally-formed island, which was used in the early 20th century to farm potatoes, but now consists mostly of marsh. It is currently a habitat for waterfowl and is used as a fishing spot.

McDonald Island is an island in the Sacramento-San Joaquin River Delta, 53 km (33 mi) south of Sacramento. The 2,400 ha (5,900-acre) island is bounded on the north by San Joaquin River, on the west by Middle River and Latham Slough, and on the south by Empire Cut. It appears unlabeled on a 1913 United States Geological Survey map of the area, and on a 1952 USGS map as "McDonald Tract".It is in San Joaquin County, California, and managed by Reclamation District 2030.

Vulcan Island (also known as Shipyard Island) is a small island in the Sacramento–San Joaquin River Delta. It is part of San Joaquin County, California. Its coordinates are 37°59′21″N 121°24′22″W, and the United States Geological Survey measured its elevation as 7 ft (2.1 m) in 1981. It appears on a 1952 USGS map of the area.

Headreach Island is a small island in the Sacramento–San Joaquin River Delta, in northern California. A naturally-formed island existing in a complex with Tule Island to the southeast and Fern Island to the northwest, it was used for farming as late as the 1920s. While several proposals for real estate development on the island were made in the late 20th century, it now consists mostly of marsh and submerged land. Black rails live on the island.

Tinsley Island is a small island in the Sacramento–San Joaquin River Delta, in San Joaquin County, California, next to the Stockton Deepwater Shipping Channel. It was created in the 1930s, when dredging to improve the navigability of the San Joaquin River cut it off from Roberts Island. Since 1958, it has been owned by the St. Francis Yacht Club. In 1960, the club transported a lighthouse from San Francisco Bay to serve as its clubhouse, and in the same year began an annual "Stag Cruise"; as of 2024, the club still owns the island and maintains a clubhouse there.

King Island is an island in the north Sacramento-San Joaquin River Delta, twenty kilometres east of Antioch, and twenty kilometres west of Stockton. The 1,300 ha (3,200-acre) island is bounded on the north by White Slough, on the east by Bishop Cut, on the south by Disappointment Slough, and on the west, Honker Cut. It is in San Joaquin County, and managed by Reclamation District 2044. It appears on a 1952 United States Geological Survey map of the area.

Ward Island (also known as Wards Island) is a small island in the Sacramento–San Joaquin River Delta. It is part of San Joaquin County, California. Its coordinates are 38°02′30″N 121°30′09″W, and the United States Geological Survey measured its elevation as 7 ft (2.1 m) in 1981. It appears on a 1952 USGS map of the area.

The Shima Tract is an island in the Sacramento–San Joaquin River Delta. It is part of San Joaquin County, California, and managed by Reclamation District 2115. Its coordinates are 38°01′40″N 121°23′06″W, and the United States Geological Survey measured its elevation as 0 ft (0 m) in 1981. It appears on a 1952 USGS map of the area.The Shima Tract was owned by (and takes its name from) George Shima, a businessman and farmer who at one point produced 85% of California's potato crop.

The Empire Tract is an island in the Sacramento–San Joaquin River Delta in San Joaquin County, California, United States. It has been used for agriculture since the 1800s; in the early 20th century it was used to plant potatoes, and United States president Herbert Hoover operated a beet farm there. In the 1960s, natural gas deposits were discovered beneath the island. In 1936, it was connected to the mainland by the Eight Mile Road Bridge, across King Island. As with many islands in the Delta, the Empire Tract has experienced considerable subsidence, and is well below sea level.