42是湖北的，10是代表黄冈市，但是没有04这个代码。

420000湖北省420100武汉市420101市辖区420102江岸区420103江汉区420104硚口区420105汉阳区420106武昌区420107青山区420111 洪山区420112东西湖区420113汉南区420114蔡甸区420115江夏区420116黄陂区420117新洲区420200黄石市420201市辖区420202黄石港区420203西塞山区420204下陆区420205铁山区420222阳新县420281大冶市420300十堰市420301市辖区420302茅箭区420303张湾区420304郧阳区420322郧西县420323竹山县420324竹溪县420325房县420381丹江口市420500宜昌市420501市辖区420502西陵区420503伍家岗区420504点军区420505猇亭区420506夷陵区420525远安县420526兴山县420527秭归县420528长阳土家族自治县420529五峰土家族自治县420581宜都市420582当阳市420583枝江市420600襄阳市420601市辖区420602襄城区420606樊城区420607襄州区420624南漳县420625谷城县420626保康县420682老河口市420683枣阳市420684宜城市420700鄂州市420701市辖区420702梁子湖区420703华容区420704鄂城区420800荆门市420801市辖区420802东宝区420804掇刀区420821京山县420822沙洋县420881钟祥市420900孝感市420901市辖区420902孝南区420921孝昌县420922大悟县420923云梦县420981应城市420982安陆市420984汉川市421000荆州市421001市辖区421002沙市区421003荆州区421022公安县421023监利县421024江陵县421081石首市421083洪湖市421087松滋市421100黄冈市421101市辖区421102黄州区421121团风县421122红安县421123罗田县421124英山县421125浠水县421126蕲春县421127黄梅县421181麻城市421182武穴市421200咸宁市421201市辖区421202咸安区421221嘉鱼县421222通城县421223崇阳县421224通山县421281赤壁市421300随州市421301市辖区421303曾都区421321随县421381广水市422800恩施土家族苗族自治州422801恩施市422802利川市422822建始县422823巴东县422825宣恩县422826咸丰县422827来凤县422828鹤峰县429000省直辖县级行政区划429004仙桃市429005潜江市429006天门市429021神农架林区