Maihiihi is a rural community in the Ōtorohanga District and Waikato region of New Zealand's North Island.

Maihiihi settlement is in an SA1 statistical area which covers 73.24 km (28.28 sq mi). The SA1 area is part of the larger Maihiihi statistical area.

Historical population of the SA1 area

Year	Pop.	±% p.a.
2006	243	—
2013	228	−0.91%
2018	219	−0.80%
Source:

The SA1 area had a population of 219 at the 2018 New Zealand census, a decrease of 9 people (−3.9%) since the 2013 census, and a decrease of 24 people (−9.9%) since the 2006 census. There were 72 households, comprising 114 males and 108 females, giving a sex ratio of 1.06 males per female. The median age was 30.1 years (compared with 37.4 years nationally), with 63 people (28.8%) aged under 15 years, 45 (20.5%) aged 15 to 29, 99 (45.2%) aged 30 to 64, and 9 (4.1%) aged 65 or older.

Ethnicities were 87.7% European/Pākehā, 19.2% Māori, 5.5% Asian, and 2.7% other ethnicities. People may identify with more than one ethnicity.

Although some people chose not to answer the census's question about religious affiliation, 65.8% had no religion, 30.1% were Christian and 2.7% had other religions.

Of those at least 15 years old, 12 (7.7%) people had a bachelor's or higher degree, and 36 (23.1%) people had no formal qualifications. The median income was $45,000, compared with $31,800 nationally. 27 people (17.3%) earned over $70,000 compared to 17.2% nationally. The employment status of those at least 15 was that 105 (67.3%) people were employed full-time, 21 (13.5%) were part-time, and 3 (1.9%) were unemployed.

Maihiihi statistical area covers 469.06 km (181.11 sq mi) and had an estimated population of 1,920 as of June 2024, with a population density of 4.1 people per km.

Historical population of the statistical area

Year	Pop.	±% p.a.
2006	1,779	—
2013	1,848	+0.55%
2018	1,833	−0.16%
Source:

Maihiihi had a population of 1,833 at the 2018 New Zealand census, a decrease of 15 people (−0.8%) since the 2013 census, and an increase of 54 people (3.0%) since the 2006 census. There were 657 households, comprising 963 males and 870 females, giving a sex ratio of 1.11 males per female. The median age was 33.3 years (compared with 37.4 years nationally), with 468 people (25.5%) aged under 15 years, 342 (18.7%) aged 15 to 29, 819 (44.7%) aged 30 to 64, and 207 (11.3%) aged 65 or older.

Ethnicities were 86.9% European/Pākehā, 21.3% Māori, 1.1% Pacific peoples, 3.9% Asian, and 1.3% other ethnicities. People may identify with more than one ethnicity.

The percentage of people born overseas was 11.1, compared with 27.1% nationally.

Although some people chose not to answer the census's question about religious affiliation, 57.3% had no religion, 31.4% were Christian, 0.3% had Māori religious beliefs, 1.0% were Hindu, 0.3% were Muslim, 0.3% were Buddhist and 2.0% had other religions.

Of those at least 15 years old, 147 (10.8%) people had a bachelor's or higher degree, and 315 (23.1%) people had no formal qualifications. The median income was $39,400, compared with $31,800 nationally. 222 people (16.3%) earned over $70,000 compared to 17.2% nationally. The employment status of those at least 15 was that 774 (56.7%) people were employed full-time, 234 (17.1%) were part-time, and 33 (2.4%) were unemployed.

Maihiihi School is a Year 1-8 co-educational state primary school. It is a decile 7 school with a roll of 66 as of August 2024.

The school gained national attention in November 2016, for a handwritten note and parcel the principal gave an autistic student.

It has also opposed the use of seclusion rooms for autistic students.