[1] Upper Holloway is the original designation of the N19 postal district and the term is still used by the Royal Mail.

[2] Upper Holloway was one of several hamlets within the ancient parish of St Mary Islington.

[3] As the population of the parish was increasing, the Church of St John Upper Holloway was built to meet local need, using the provisions of the Church Building Act 1818.

[4][5] The area around Hornsey Road was traditionally known as "Tollington" and this name was used in the Domesday Book.

The classic late Victorian comic novel Diary of a Nobody is set in Upper Holloway.