The highest place value in the decimal system is the aleph null'th place. It should be noted that aleph null is an infinite number (in fact, it is the smallest infinity possible) and represents the cardinality of the natural number set.
In other words, there is no finite number which is the highest place value in the decimal system.
(The Aleph character breaks Answers.com's WYSIWYG editor. The Aleph null character looks like: 0א except that the 0 is on the other side of the aleph character )
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9 in the decimal system
The highest place value in a decimal number is the left most digit, also the first digit.
1954
The defining property of the decimal number system is that the place value of each digit is ten times the place value of the digit to its right.
9 (in decimal). In any other base, it is (base-1)