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 allocation 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 adjacent to it in the east allocation of the CDP; both communities abut Port Townsend Bay. Chimacum is upon 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 km²), of which 6.7 square miles (17.3 km²) are home and 1.1 square miles (2.8 km²), 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/km²). 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 extra races, and 5.0% from two or more races. Hispanic or Latino of any race were 2.5% of the population.

There were 1,407 households, out of which 34.6% had children under the age of 18 living as soon as them, 51.6% were married couples busy together, 11.4% had a female householder in the spread of no husband present, and 32.1% were non-families. 25.8% of anything households were made occurring of individuals, and 9.1% had someone animated alone who was 65 years of age or older. The average household size was 2.47 and the average family size was 2.96.