Hudson Falls (formerly Sandy Hill) is a village located in Washington County, New York, United States. The village is in the southwest of the town of Kingsbury, on U.S. Route 4. Hudson Falls is part of the Glens Falls Metropolitan Statistical Area. As of the 2010 census, the village had a population of 7,281. It was the county seat of Washington County until 1994, when the county seat was moved to Fort Edward.
 In 1764, Albert Baker built Kingsbury's first sawmill near what is known today as Baker's Falls. As early as 1792, the area of Kingsbury near Baker's Falls was referred to as Sandy Hill. In 1810, the hamlet incorporated as a village, keeping the name Sandy Hill. Its boundaries expanded to their current limits in the 1840s.
 Around 1824, the Glens Falls Feeder Canal was constructed to bring water from the Hudson River to the Champlain Canal. With the opening of the Feeder Canal, Sandy Hill became a prosperous manufacturing center, producing lumber, paper, pianos, wagons, pulleys, and other products. The Glens Falls Feeder Canal is no longer used commercial traffic, but the route of Canal is a fourteen mile long park, with a walking & bike trail on the old tow path.
 Stone quarried in Hudson Falls was used to construct the Bennington Battle Monument (1889) and the Brooklyn Bridge. The former site of the quarry has been redeveloped for use by the Washington-Saratoga-Warren-Hamilton-Essex Board of Cooperative Educational Services.
 In 1851, Francis Wolle invented the first bag-making machine, and formed a company that would later become the Union Bag and Paper Company. In 1892, the company relocated from Bethlehem, Pennsylvania to Hudson Falls, where it had a paper mill. In 1906, Union Paper and Bag Co. built the Fenimore Bridge (Sandy Hill Bridge), spanning the Hudson River between Hudson Falls built in Washington County and town of Moreau in Saratoga County, since the company had plants in both locations. For a brief period of time, the closed-spandrel arch bridge was the longest multiple span, reinforced-concrete arch bridge in the world. The bridge is now closed, but local officials hope to turn it into a pedestrian walkway.[citation needed]
 In 1910, the village's name was changed from Sandy Hill to Hudson Falls. The Glens Falls Feeder Canal, Hudson Falls Historic District, and United States Post Office are listed on the National Register of Historic Places.
 According to the United States Census Bureau, the village has a total area of 1.9 square miles (4.9 km2), of which 1.8 square miles (4.7 km2)  is land and 0.04 square miles (0.10 km2)  is water. The total area is 2.13% water.
 The village is on the east bank of the Hudson River at the western border of Washington County. A village green lies in the center of the commercial district.
 NY Route 196 (Maple Street) and NY Route 254 (River Street) intersect US Route 4 in Hudson Falls.
 As of the census of 2000, there were 6,927 people, 2,876 households, and 1,760 families residing in the village. The population density was 3,763.5 inhabitants per square mile (1,453.1/km2). There were 3,120 housing units at an average density of 1,695.1 per square mile (654.5/km2). The racial makeup of the village was 97.91% White, 0.45% African American, 0.22% Native American, 0.25% Asian, 0.00% Pacific Islander, 0.16% from other races, and 1.02% from two or more races. 0.68% of the population is Hispanic or Latino of any race.
 There were 2,876 households, out of which 31.4% had children under the age of 18 living with them, 40.7% were married couples living together, 15.5% had a female householder with no husband present, and 38.8% were non-families. 32.0% of all households were made up of individuals, and 13.7% had someone living alone who was 65 years of age or older. The average household size was 2.37 and the average family size was 2.95.
 In the village, the population was spread out, with 25.2% under the age of 18, 8.9% from 18 to 24, 30.6% from 25 to 44, 20.6% from 45 to 64, and 14.6% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 88.5 males. For every 100 females age 18 and over, there were 83.8 males.
 The median income for a household in the village was $31,516, and the median income for a family was $37,628. Males had a median income of $31,107 versus $21,215 for females. The per capita income for the village was $17,575. 17.2% of the population and 12.8% of families were below the poverty line. 30.3% of those under the age of 18 and 6.3% of those 65 and older were living below the poverty line.
 Amtrak, the national passenger rail system, provides service to Hudson Falls at the station in nearby Fort Edward, operating its Adirondack daily in both directions between Montreal and New York City, and its Ethan Allen Express in both directions daily between New York City and Rutland. Amtrak has designated the stop as Fort Edward-Glens Falls.
 Freight rail service is provided along a spur line extending from Fort Edward to Glens Falls that runs through the village.
 The fictional town of Millers Kill, NY, in Julia Spencer-Fleming's mystery novels is loosely based on Hudson Falls.