Port Hadlock-Irondale is a census-designated place (CDP) in Jefferson County, Washington, United States. The population was 3,580 at the 2010 census.

Port Hadlock-Irondale is located in northeastern Jefferson County at 48°2′12″N 122°46′30″W / 48.03667°N 122.77500°W / 48.03667; -122.77500 (48.036614, -122.774938), on the Quimper Peninsula, an arm of the northeast corner of the Olympic Peninsula. The CDP includes the communities of Port Hadlock and Irondale, plus portion of Chimacum, all of which form what is locally known as the “tri-area”. Irondale is in the northeast corner of the CDP, and Port Hadlock is against it in the east allowance of the CDP; both communities abut Port Townsend Bay. Chimacum is on the southern edge of the CDP, in the Chimacum Valley at the intersection of Washington State Route 19 and Chimacum Road. The CDP extends to the west to within 0.5 miles (0.8 km) of Discovery Bay.

The community is 8 miles (13 km) south of Port Townsend and 18 miles (29 km) north of Port Gamble. According to the United States Census Bureau, the CDP has a total area of 7.8 square miles (20.1 km), of which 6.7 square miles (17.3 km²) are land and 1.1 square miles (2.8 km), or 13.77%, are water.

As of the census of 2000, there were 3,476 people, 1,407 households, and 955 families residing in the CDP. The population density was 521.3 people per square mile (201.2/km²). There were 1,537 housing units at an average density of 230.5/sq mi (89.0/km). The racial makeup of the CDP was 90.7% White, 0.3% African American, 1.9% Native American, 1.4% Asian, 0.1% Pacific Islander, 0.6% from other races, and 5.0% from two or more races. Hispanic or Latino of any race were 2.5% of the population.