Seddon, New Zealand

Seddon is described by Stats NZ as a rural settlement. It covers 1.66 km² (0.64 sq mi)^[4] and had an estimated population of 570 as of June 2025,^[5] with a population density of 343 people per km². It is part of the wider Awatere statistical area.^[18][19]

Seddon had a population of 561 in the 2023 New Zealand census, an increase of 9 people (1.6%) since the 2018 census, and an increase of 72 people (14.7%) since the 2013 census. There were 291 males, 261 females, and 6 people of other genders in 225 dwellings.^[22] 3.2% of people identified as LGBTIQ+. The median age was 41.5 years (compared with 38.1 years nationally). There were 99 people (17.6%) aged under 15 years, 84 (15.0%) aged 15 to 29, 294 (52.4%) aged 30 to 64, and 81 (14.4%) aged 65 or older.^[20]

People could identify as more than one ethnicity. The results were 84.0% European (Pākehā); 23.5% Māori; 3.7% Pasifika; 2.1% Asian; 0.5% Middle Eastern, Latin American and African New Zealanders (MELAA); and 2.1% other, which includes people giving their ethnicity as "New Zealander". English was spoken by 97.3%, Māori by 4.3%, and other languages by 6.4%. No language could be spoken by 1.6% (e.g. too young to talk). New Zealand Sign Language was known by 1.1%. The percentage of people born overseas was 15.5, compared with 28.8% nationally.^[20]

Religious affiliations were 21.9% Christian, 0.5% Islam, 0.5% Māori religious beliefs, and 2.1% other religions. People who answered that they had no religion were 64.7%, and 10.2% of people did not answer the census question.^[20]

Of those at least 15 years old, 30 (6.5%) people had a bachelor's or higher degree, 252 (54.5%) had a post-high school certificate or diploma, and 174 (37.7%) people exclusively held high school qualifications. The median income was $40,700, compared with $41,500 nationally. 18 people (3.9%) earned over $100,000 compared to 12.1% nationally. The employment status of those at least 15 was 249 (53.9%) full-time, 66 (14.3%) part-time, and 9 (1.9%) unemployed.^[20]

State Highway 1 passes through Seddon on its route between Blenheim and Christchurch.

The Marlborough section of the Main North Line railway reached Seddon from Blenheim in October 1902.^[23] This also saw the construction of a combined road-rail bridge over the Awatere River north of the town, with the single-lane road below the rail. The bridge remained in service for road traffic until October 2007, when a new two-lane road bridge opened.^[24] Seddon was the southern terminus of the railway until the line was extended to Ward in April 1911; the full line through to Christchurch didn't open until December 1945.^[23] Today, Seddon is served by the Coastal Pacific train, which runs once daily each way during the summer months.

A train derailment at Blind River, south of Seddon, on 25 February 1948, killed six people and injured 40 others.^[25]

• 
  The double decker bridge across the Awatere River
• 
  Trains use the upper level of the bridge. Road transport used the lower level until a new bridge was opened in November 2007.

Seddon School is the sole school in the town. It is a coeducational full primary (year 1–8) school^[26] with a roll of 127 as of July 2026.^[27] It opened in 1883.^[28] Seaview, Marama, Blind River, Grassmere and Tetley Brook schools in the lower Awatere Valley amalgamated to Seddon School in 1938.^[29][30]

The nearest state secondary schools are Marlborough Boys' College and Marlborough Girls' College in Blenheim.