Reduce the list. Postcodes starting with:

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Postcodes (68 items):
3000000 (1)
3010000 (1)
3020000 (1)
3030000 (1)
3070000 (1)
3090000 (1)
3100000 (1)
3110000 (1)
3120000 (1)
3130000 (1)
3140000 (1)
3150000 (1)
3160000 (1)
3170000 (1)
3220000 (1)
3230000 (1)
3240000 (1)
3250000 (1)
3260000 (1)
3270000 (1)
3340000 (1)
3360000 (1)
3370000 (1)
3380000 (1)
3390000 (1)
3400000 (1)
3410000 (1)
3420000 (1)
3430000 (1)
3460000 (1)
3490000 (1)
3500000 (1)
3510000 (1)
3520000 (1)
3530000 (1)
3540000 (1)
3550000 (1)
3560000 (1)
3570000 (1)
3580000 (1)
3600000 (1)
3610000 (1)
3620000 (1)
3630000 (1)
3640000 (1)
3650000 (1)
3660000 (1)
3690000 (1)
3710000 (1)
3720000 (1)
3780000 (1)
3820000 (1)
3840000 (1)
3850000 (1)
3860000 (1)
3870000 (1)
3880000 (1)
3890000 (1)
3900000 (1)
3910000 (1)
3920000 (1)
3930000 (1)
3940000 (1)
3950000 (1)
3960000 (1)
3970000 (1)
3980000 (1)
3990000 (1)