Found this list online. Maybe it'll help you out?
Foods Highest in Potassium (per 200 Calories)
1.LEAVENING AGENTS,CRM OF TARTAR : 12790.7mg of Potassium
2.TEA,INST,UNSWTND,PDR : 5153.1mg of Potassium
3.PARSLEY,FREEZE-DRIED : 4649.4mg of Potassium
4.CHERVIL,DRIED : 4000mg of Potassium
5.CORIANDER LEAF,DRIED : 3201.4mg of Potassium
6.CELERY FLAKES,DRIED : 2751.1mg of Potassium
7.PARSLEY,DRIED : 2757.2mg of Potassium
8.COFFEE,INST,REG,PDR : 2933.6mg of Potassium
9.RADISHES,ORIENTAL,DRIED : 2578.6mg of Potassium
10.TEA,INST,UNSWTND,LEMON-FLAVORED,PDR : 2325.3mg of Potassium
11.SPICES,BASIL,DRIED : 2735.5mg of Potassium
12.TOMATOES,SUN-DRIED : 2656.6mg of Potassium
13.COFFEE,INST,W/CHICORY,PDR : 1934.5mg of Potassium
14.DILL WEED,DRIED : 2615mg of Potassium
15.PEPPERS,SWT,RED,FREEZE-DRIED : 2019.1mg of Potassium
16.KRAFT,CRYSTAL LT SG FR LO CAL SOFT DRK MIX LEMONAD,W/SWN,PDR : 2750.9mg of Potassium
17.ORANGE-FLAVOR DRK,BRKFST TYPE,LO CAL,PDR : 2886.6mg of Potassium
18.SPICES,TARRAGON,DRIED : 2047.5mg of Potassium
19.CHIVES,FREEZE-DRIED : 1903.5mg of Potassium
20.COCOA MIX,W/ ASPT,LO CAL,PDR,W/ ADD CA P,WO/ ADD NA OR VIT A : 1505.3mg of Potassium
21.YEAST EXTRACT SPREAD : 3291.1mg of Potassium
22.SOY FLOUR,LOW-FAT : 1381.7mg of Potassium
23.SOY FLR,LOW-FAT,CRUDE PROT BASIS (N x 6.25) : 1393mg of Potassium
24.TEA,INST,SWTND W/NA SACCHARIN,LEMON-FLAV,PDR,DECAFFEINATED : 1508.9mg of Potassium
25.CARROT,DEHYDRATED : 1489.7mg of Potassium
26.TURMERIC,GROUND : 1426.6mg of Potassium
27.FRUIT-FLAVORED DRK,PDR,W/HI VIT C,LO CAL - SEE14404 : 2218.5mg of Potassium
28.SOY FLOUR,FULL-FAT,RAW : 1153.7mg of Potassium
29.SOY FLR,FULL-FAT,RAW,CRUDE PROT BASIS (N X 6.25) : 1159mg of Potassium
30.COCOA,DRY PDR,HI-FAT OR BRKFST,PROC W/ALKALI : 1701mg of Potassium
31.MOLASSES,BLACKSTRAP : 2120.9mg of Potassium
32.SOY MEAL,DEFATTED,RAW,CRUDE PROT BASIS (N X 6.25) : 1477.7mg of Potassium
33.COFFEE SUB,CRL GRAIN BEV,PDR : 1357.2mg of Potassium
34.PEPPER,ANCHO,DRIED : 1716mg of Potassium
35.LEEKS,(BULB&LOWER-LEAF PORTION),FREEZE-DRIED : 1495.3mg of Potassium
36.SOY FLR,DEFATTED,CRUDE PROT BASIS (N X 6.25) : 1458.1mg of Potassium
37.SOY FLOUR,DEFATTED : 1444.8mg of Potassium
38.PAPRIKA : 1622.1mg of Potassium
39.WHEY,ACID,DRIED : 1350.4mg of Potassium
40.DAIRY DRK MIX,CHOC,RED CAL,W/ASPRT,PDR : 1503.4mg of Potassium
41.PEPPERS,PASILLA,DRIED : 1288.1mg of Potassium
42.SOY PROT CONC,PRODUCED BY ALCOHOL EXTRACTION : 1330.5mg of Potassium
43.BEVERAGE,MILKSHAKE MIX,DRY,NOT CHOC : 1341.5mg of Potassium
44.SISYMBRIUM SP. SEEDS,WHL,DRIED : 1339.6mg of Potassium
45.WHEY,SWEET,DRIED : 1178.5mg of Potassium
46.SOY FLR,FULL-FAT,RSTD : 925.6mg of Potassium
47.PEPPER,RED OR CAYENNE : 1266.7mg of Potassium
48.BREADNUTTREE SEEDS,DRIED : 1095.9mg of Potassium
49.LEAVENING AGENTS,YEAST,BAKER'S,ACTIVE DRY : 1355.9mg of Potassium
50.GELATIN DSSRT,DRY MIX,RED CAL,W/ ASPRT,ADDED P,K,NA,VIT C : 1150.7mg of Potassium
51.TOMATO POWDER : 1276.2mg of Potassium
52.SPEARMINT,DRIED : 1350.2mg of Potassium
53.COCOA MIX,NESTLE,CARNATION NO SUGAR HOT COCOA MIX : 1052.6mg of Potassium
54.CHILI POWDER : 1220.4mg of Potassium
55.MEAT EXTENDER : 1215.3mg of Potassium
56.PEPPERS,HOT CHILE,SUN-DRIED : 1154.3mg of Potassium
57.COTTONSEED MEAL,PART DEFATTED (GLANDLESS) : 1018.5mg of Potassium
58.COFFEE&COCOA (MOCHA) PDR,W/WHTNR&LO CAL SWTNR : 1444.4mg of Potassium
59.APRICOTS,DEHYD (LOW-MOISTURE),SULFURED,UNCKD : 1156.2mg of Potassium
60.POTATOES,MSHD,DEHYD,GRANULES W/MILK,DRY FORM : 1032.4mg of Potassium
61.PALM HEARTS,RAW : 3140.9mg of Potassium
62.SOYBEANS,MATURE SEEDS,RAW : 863.9mg of Potassium
63.BEANS,WHITE,MATURE SEEDS,RAW : 1078.1mg of Potassium
64.MILK,DRY,NONFAT,REG,WO/ VIT A : 991.2mg of Potassium
65.CUMIN SEED : 953.6mg of Potassium
66.COTTONSEED FLR,PART DEFATTED (GLANDLESS) : 987.2mg of Potassium
67.LIMA BNS,LRG,MATURE SEEDS,RAW : 1020.1mg of Potassium
68.SAFFRON : 1112.3mg of Potassium
69.KRAFT,CRYSTAL LT SUGAR FREE LO CAL ICED TEA MIX,W/ASPRT,PDR : 1212mg of Potassium
70.MILK,DRY,NONFAT,INST,WO/ VIT A : 952.5mg of Potassium
71.BEVERAGE,INST BRKFST PDR,CHOC,SUGAR-FREE,NOT RECON : 952.5mg of Potassium
72.FENNEL SEED : 982mg of Potassium
73.SPICES,OREGANO,DRIED : 1090.8mg of Potassium
74.SHALLOTS,FREEZE-DRIED : 948.3mg of Potassium
75.POTATO CHIPS,FAT FREE,SALTED : 859.1mg of Potassium
76.ONIONS,DEHYDRATED FLAKES : 929.5mg of Potassium
77.KRAFT,GENERAL FOODS INTRN COFF SGR&FT FR MOCHA FLV INST,W/A : 949.6mg of Potassium
78.SOY PROT ISOLATE,K TYPE : 975.5mg of Potassium
79.KANPYO,(DRIED GOURD STRIPS) : 1226.4mg of Potassium
80.COCOA,DRY PDR,HI-FAT OR BRKFST,PLN : 1052.8mg of Potassium
81.TOMATOES,SUN-DRIED,PACKED IN OIL,DRND : 1469.5mg of Potassium
82.CURRY POWDER : 949.5mg of Potassium
83.BEANS,SML WHITE,MATURE SEEDS,RAW : 917.9mg of Potassium
84.MUSHROOMS,SHIITAKE,DRIED : 1036.5mg of Potassium
85.SOUP,MINESTRONE,DEHYD,DRY : 854.7mg of Potassium
86.COCOA,DRY PDR,UNSWTND : 1331mg of Potassium
87.MARJORAM,DRIED : 1123.2mg of Potassium
88.PUDDINGS,CHOC FLAVOR,LO CAL,REG,DRY MIX : 975.3mg of Potassium
89.BEANS,BLACK TURTLE SOUP,MATURE SEEDS,RAW : 885mg of Potassium
90.BANANAS,DEHYD,OR BANANA PDR : 861.8mg of Potassium
91.BEANS,KIDNEY,CALIFORNIA RED,MATURE SEEDS,RAW : 903mg of Potassium
92.RICE BRAN,CRUDE : 939.9mg of Potassium
93.BEANS,BLACK,MATURE SEEDS,RAW : 869.8mg of Potassium
94.MOLASSES : 1009.7mg of Potassium
95.BEANS,PINK,MATURE SEEDS,RAW : 853.6mg of Potassium
96.COD,ATLANTIC,DRIED&SALTED : 1005.5mg of Potassium
97.ANISE SEED : 855.2mg of Potassium
98.KRAFT,JELLO SGR FR CK&SRV RED CAL PUD&PIE FLNG CHOC,W/ A : 896.8mg of Potassium
99.SEAWEED,SPIRULINA,DRIED : 940mg of Potassium
100.SNACKS,POTATO CHIPS,FAT-FREE,MADE W/OLESTRA : 973.6mg of Potassium
101.CEREALS RTE,QUAKER,KRETSCHMER TSTD WHEAT BRAN : 1284mg of Potassium
102.CORIANDER SEED : 850.3mg of Potassium
103.PEPPER,BLACK : 987.5mg of Potassium
104.BREADNUTTREE SEEDS,RAW : 1090.3mg of Potassium
105.WHEAT BRAN,CRUDE : 1094.4mg of Potassium
106.APRICOTS,DRIED,SULFURED,UNCKD : 964.3mg of Potassium
107.BREADFRUIT SEEDS,ROASTED : 1045.4mg of Potassium
108.CEREALS RTE,KELLOGG,KELLOGG'S ALL-BRAN W/ EX FIBER : 1093.8mg of Potassium