2025 yılı verilerine göre İzmit'in en büyük mahallesi Yenişehir Mahallesi'dir. Bu mahallede yaklaşık 23.429 kişi yaşamaktadır 1. İkinci sırada ise Yahya Kaptan Mahallesi yer almakta olup, nüfusu yaklaşık 21.427'dir 1.
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