Croatian post code number with HR prefix checker

PostCodeCheck.cs

private static bool IsCroatianPostOfficeNumberWithHRPrefix(string postCode)
		{
			// ref: https://hr.wikipedia.org/wiki/Po%C5%A1tanski_broj

			if (postCode.StartsWith("HR"))
			{
				var postCodeWithoutHR = postCode.Substring(2);

				if ( postCodeWithoutHR.StartsWith("10")

					|| postCodeWithoutHR.StartsWith("20")
					|| postCodeWithoutHR.StartsWith("21")
					|| postCodeWithoutHR.StartsWith("22")
					|| postCodeWithoutHR.StartsWith("23")

					|| postCodeWithoutHR.StartsWith("31")
					|| postCodeWithoutHR.StartsWith("32")
					|| postCodeWithoutHR.StartsWith("33")
					|| postCodeWithoutHR.StartsWith("34")
					|| postCodeWithoutHR.StartsWith("35")

					|| postCodeWithoutHR.StartsWith("40")
					|| postCodeWithoutHR.StartsWith("42")
					|| postCodeWithoutHR.StartsWith("43")
					|| postCodeWithoutHR.StartsWith("44")
					|| postCodeWithoutHR.StartsWith("47")
					|| postCodeWithoutHR.StartsWith("48")
					|| postCodeWithoutHR.StartsWith("49")

					|| postCodeWithoutHR.StartsWith("51")
					|| postCodeWithoutHR.StartsWith("52")
					|| postCodeWithoutHR.StartsWith("53"))
				{
					// NOTE: rest of the characters must be digits resulting in 5 digit number if it is a valid post code number in Croatia
					return int.TryParse(postCodeWithoutHR, out var _);
				}
			}

			return false;
		}