Postal Zone Charts   (Effective Date: June 30, 2002)
 

To find your zone from 70656 (my zip code), use the first 3 digits of your zip code.  For example, if your zip is 29204, you will look for 292.  It is in the first column - 270..299, and that is zone 5.
 

ZIP Code Prefix	Zone	ZIP Code Prefix	Zone	ZIP Code Prefix	Zone	ZIP Code Prefix	Zone
005	6	387	3	636..639	4	776..777	1*
006..009	8	388	4	640..642	5	778..784	3*
010..013	6	389..396	3	644..646	5	785	4*
014..059	7	397..399	4	647..648	4	786..789	3*
060..098	6	400..418	5	649	5	790..797	4*
100..128	6	420..424	4	650..658	4	798..799	5*
129	7	425..427	5	660..666	5	800..815	5
130..149	6	430..443	5	667	4	816	6
150..154	5	444..445	6	668..669	5	820	5
155..212	6	446..475	5	670..673	4	821..832	6
214..227	6	476..477	4	674	5	833	7
228..229	5	478..483	5	675	4	834	6
230..238	6	484..487	6	676..681	5	835..838	7
239..253	5	488..495	5	683..693	5	840..847	6
254	6	496..499	6	700..701	3	850	6
255..266	5	500..516	5	703	2	852..853	6
267	6	520..528	5	704	3	855..857	6
268	5	530..532	5	705	1	859..860	6
270..299	5	534..535	5	706	1*	863..864	6
300..303	4	537..540	5	707..708	2	865	5
304..306	5	541..543	6	710..712	3*	870..875	5
307	4	544	5	713..714	2	877..884	5
308..309	5	545	6	716..717	3	885	5*
310..312	4	546..547	5	718	3*	889..891	6
313..315	5	548	6	719..722	3	893	6
316..319	4	549..555	5	723..731	4	894..895	7
320..322	5	556..558	6	733	3*	897..898	7
323..325	4	559..561	5	734..738	4	900..908	7
326..342	5	562..567	6	739	5	910..928	7
344	5	570..571	5	740..741	4	930..954	7
346..347	5	572..577	6	743..746	4	955	8
349	5	580..588	6	747	3*	956..966	7
350..352	4	590..593	6	748..749	4	967..975	8
354..364	4	594..599	7	750..758	3*	976..979	7
365..366	3	600..619	5	759	2*	980..986	8
367..368	4	620	4	760..762	3*	988..989	8
369	3	622	4	763	4*	990..994	7
370..375	4	623..628	5	764..767	3*	995..999	8
376..379	5	629..633	4	768..769	4*
380..386	4	634..635	5	770..775	2*